Thanks for your e-mail!  I am on vacation until September 28th.  If you need to
contact someone prior to that time, please send your inquiry to
info@... and it will be routed to the proper person.

Thanks,

David Hyre
Adire Audio

From LAUD?........?wouldn't the voltages displayed in the time file be those
peak values?
   ----- Original Message -----
   From: audionuttt@...
   To: lauduserslist@yahoogroups.com
   Sent: Monday, September 10, 2001 11:00 AM
   Subject: [lauduserslist] SPL


   All,

   Would anybody happen to know where I can find an equation to convert an SPL
   reading to a PEAK static pressure?

   Thanks

   Deon

         Yahoo! Groups Sponsor



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[Non-text portions of this message have been removed]

Thanks for your e-mail!  I am on vacation until September 28th.  If you need to
contact someone prior to that time, please send your inquiry to
info@... and it will be routed to the proper person.

Thanks,

David Hyre
Adire Audio

In a message dated 9/10/01 2:27:18 PM Central Daylight Time,
kmgrdn@... writes:

<< From LAUD?........?wouldn't the voltages displayed in the time file be
those peak values? >>

Not for LAUD.

David:
I banned you during vacation. When you get back pleaser remind me
and I will put you back.
Phil
----- Original Message -----
From: <DHyre@...>
To: <lauduserslist@yahoogroups.com>
Sent: Monday, September 10, 2001 12:18 PM
Subject: [lauduserslist] Vacation


: Thanks for your e-mail!  I am on vacation until September 28th.
If you need to contact someone prior to that time, please send
your inquiry to info@... and it will be routed to the
proper person.
:
: Thanks,
:
: David Hyre
: Adire Audio
:
: ------------------------ Yahoo! Groups
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:

David Carlstrom wrote:

> 159 TH  SMWTMS MEETING DETAILS
>
> DATE:  Saturday  September 15, 2001
>
> TIME:  2 PM Until ?
>
> FORMAL MEETING:  4 PM
>
> COHOST:  Eric Peterson
>
> HOST: DLC Design
> 47677 Avante Dr.
> Wixom MI 48393
>  (248) 305-5534
>
> *** DOORS OPEN at 10 AM for autosound system tweaking and measurements ***
>
> AUTOSOUND TWEAKING:  DLC Design autosound measurement equipment will be
> available starting at 10:00 AM for any member who wishes to make
> measurements and adjustments prior to the contest.  Tuning will be in the
> West Bay of DLC Design.
>
> PROGRAM:  AUTOSOUND CONTEST XIX:  MARTIN MARTH AUTOSOUND PRIZE:
>
> AUTOSOUND CONTEST JUDGING: Judging will be in the DLC Design East Bay.  New
> this year!  Objective judge!  Cars will be judged solely on objective PTF
> (Perceptual Transfer Function) measurements.  PTF includes, tone balance
> frequency response, maximum SPL, maximum bass SPL, and Spatial Rendition.
> Prizes will be funded from the proceeds of the SMWTMS Martin Marth Auction.
>
> AUTOSOUND CONTEST RULES:  The autosound contest rules are the same as last
> year, except that the old rule 4 is deleted.  The rules are:   1)  No charge
> for entering the autosound contest;  2)  Non-members must join SMWTMS for
> 2002 to enter the autosound contest;  3) Frivolous entries may be rejected
> by the judges.
>
> AUTOSOUND CONTEST REPORT:  David Clark will talk about the decision to use
> entirely objective judging for the SMWTMS Autosound Contest and award the
> prizes.
>
> MORE TWEAKING:  Time permitting, tuning for best PTF score may be attempted.
>
> HOST ASSIGNMENTS:  Please check your host and co-host assignments below.
> Note that assignments are made to give hosts and cohosts fair warning.  In
> spite of the appearance of rigidity, the schedule is flexible.  Volunteered
> changes are welcome.  If you have a suggestion, do not hesitate to offer it.
> Contact David Carlstrom with your ideas.
>
> CALENDAR:  DATE / PROGRAM / HOST   / CO-HOST:
>
> 11/10/2001 / ???   / Ray Kilmanas  / Duane Mitchell
>   1/19/2002 / ???   / ???   / ???

Robert Zurek wrote:

> The following is a letter from the AES Executive Director Roger Furness
> regarding the postponement of the 111th AES Convention to November 30th -
> December 3rd 2001.
>
> Sincerely,
> Bob Zurek
> AES Chicago Section Secretary
>
> Dear All
>
> In view of the tragic events that took place yesterday there has been a
> lot
> of speculation as to whether the AES 111th Convention would proceed next
>
> week, as planned.
>
> There were several factors to be taken into consideration and a
> necessity to
> have discussions with other parties. For this reason we did not make a
> hasty
> statement.
>
> We have just returned from the Javits Center where we had a meeting with
>
> their top management. We learned that the New York City Mayor's Office
> of
> Emergency Management and the Federal Emergency Management Agency (FEMA)
> have
> taken over large portions of the Javits Center for use in coordinating
> emergency services. We also learned that FEMA will have complete control
> of
> these spaces and any others that they need, for an undetermined period.
> This
> obviously makes holding the event as planned impossible. However, we
> were
> able to reschedule the convention, rather than just cancel it. Most of
> the
> people who contacted us hoped that this would be the solution.
>
> The new dates will be Friday, November 30 to Monday, December 3, 2001,
> with
> the same exhibit, demo and conference space as would have been used next
> week.
>
> We at the Audio Engineering Society would like to thank those of you who
> took
> the time and trouble to inquire about the safety of the staff here in
> the New
> York Office and to wish us well and give us your support. This was much
> appreciated.
>
> Lastly at this sad time, we would like to spare a thought for those who
> have
> had their lives so much more severely disrupted than any of us. We were,
> and
> are, very sensitive to their feelings. Let us hope that we can look
> forward
> to better times ahead.
>
> Sincerely
>
> Roger Furness
> Executive Director
>
> Audio Engineering Society
> 60 E. 42nd Street, Room 2520
> New York, NY 10165  USA
> Tel: +1 212-661-8528
> Fax: +1 212-682-0477
> Email: HQ@...
> Http://www.aes.org
>
> Save the Dates of 2001 AES Events!
>
> AES 20th International Conference, October 5-7, 2001, Budapest, Hungary
> AES 111th Convention, Nov 30 - Dec 3, 2001, New York, New York USA

Robert Zurek wrote:

> PLEASE POST THIS NOTICE IN YOUR OFFICE
>
> Audio Engineering Society
> Chicago Section
>
> Wednesday, October 10th 2001, 7:30 PM
>
> The EIA-426-B Loudspeaker Power Rating Compact Disc. What's on it? How
> do I use it?
> By: D. B. Keele of Harman/Becker Automotive Systems
>
> The next meeting of the AES Chicago Section will be held on Wednesday,
> October 10 at the Holiday Inn North Shore in Skokie. D. B. Keele, will
> discuss the EIA-426-B loudspeaker power rating compact disc.
> The EIA-426-B standard: "Loudspeakers, Optimum Amplifier Power" (April
> 1998) specifies a test CD that contains the calibration and test signals
> for all the tests defined in the standard. This CD is intended to
> improve the consistency and convenience of the standard and will be made
> available through the EIA and other sources. This talk describes the
> CD's test signals and their development, and outlines the procedures to
> make best use of the disk in setting the power ratings of loudspeakers
> and the amplifiers that drive them. The talk also briefly describes the
> development process of the signals placed on the CD with emphasis on the
> spectral-shaped random noise signal used for life testing and the
> variable-rate sine-wave sweep test signal used for power compression
> tests. Statistics and measurements are described for the signals as
> placed on the CD and for the signals as played back on a typical CD
> player. Brief demonstrations of the sound of the signals and their
> application will be presented.
>
> Dinner will begin at 6:30pm with the presentation immediately following
> dinner at about 7:30pm. For menu information or to make dinner
> reservations, call Treasurer Simone Koo at (815) 884-2133 by noon on
> October 10th. You can also reach Simone by calling his pager at (888)
> 597-8606 or 5978606@.... All AES members will receive a $1.00
> discount on dinner. All student members (with student ID) will receive a
> $10.00 discount.
>
> Meeting Location:
> Holiday Inn North Shore in Skokie
> 5300 West Touhy Avenue Skokie, IL
> (at the northeast corner of Touhy and Niles Center Road)
>
> E-MAIL LIST
> If you would like to continue to receive the monthly newsletters for the
> Chicago Section, either send your email address to Bob Zurek at
> w15754@... or call Bob at (815) 884-1361 to remain on the
> print mail list. If you do not do either you will not get the local
> newsletters after November 2001. Meeting notices are always available on
> our section’s website at www.aes.org/sections/chicago
>
> Goodman Theatre Tour Recap…by Giles Davis
> On Monday, February 26, forty-four members and guests were treated to a
> tour of the Goodman Theatre. Dr. Gary Madaras of the Talaske Group and
> Kevin Tucker of RC Communications presented various challenges and their
> associated solutions for the Albert theatre, followed by a tour of the
> Albert. We then went over to the Owen theatre for another presentation
> and tour. Jeff Muskovin of the Goodman Theatre was on hand to help field
> questions.
>
> The Owen Bruner Goodman Theater was the smaller, more flexible theater.
> It was set up as a thrust stage, with the majority of the roughly 400
> seats to either side of the stage. The objective for this redesign was
> to have greater seating than the old studio theater, which was 135
> seats. A “black box” theater was not wanted, but rather one with many
> stage options to allow audience-to-stage experimentation. Typical
> seating ranges from 370 to 425, depending on setup. However, most of the
> challenges seemed centered around the Albert theatre.
>
> The Albert theatre is in more of the classic style, with a fixed stage
> beneath a proscenium with loge and balcony seating. Originally slated to
> be a 950-seat house, the 850-seat redesign was deemed more intimate. The
> reinforcement system utilizes Meyer active speakers. The main console is
> a 40-channel Soundcraftsman, which is used for voice only. The special
> effects are handled by a hard-disk based 8x8 matrix. They have 24
> channels of Shure UHF wireless microphones, but explained that they
> typically use hard-wired microphones. Due to the proximity of the two
> theaters, the “assistive listening” headsets by Sennheiser were infrared
> instead of radio frequency. Video requirements were minimal, and
> included video for the stage managers, in the lobby for late arrivals,
> and conductor and trap effects.
>
> One of the considerations for acoustical consultants is balcony height.
> Once this has been established, sight lines can be determined for the
> mix position to the central cluster. At the Albert, the balcony height
> was fixed and constant all the way through Contract Documents – and was
> then lowered two feet. As a result, the back row or two suffers a bit
> acoustically, and the sight line to the cluster is challenged.
> Loudspeakers were added beneath the balcony to help with
> intelligibility.
>
> In order to shape the room response, there was fixed absorption under
> the balcony and the side walls under the balcony. The rear walls were
> fabric-covered QRD’s (quadratic residue diffusers) instead of
> absorption. While many consultants may try to “kill” the rear wall
> reflection, a Talaske design objective is to get as much energy back to
> the stage as possible. With this approach, particular attention must be
> paid to common-time arrivals, so the rear walls of their theaters tend
> to undulate as you move side to side. It was explained that the balcony
> serves as a corner reflector to serve audience members to the back and
> sides of the main floor. There was no fixed absorption near the front of
> the theater. The side walls next to the proscenium are hard, primary
> reflectors. While the rear wall beneath the balcony is primarily
> diffusive, there is absorption on the rear wall of the balcony. To
> prevent the ceiling/real wall from forming a corner reflector, the
> ceiling juts up about 8” at the back and sound absorption is used there
> in order to prevent a late reflection to the stage.
>
> Another design objective for a Talaske theatre is to fix the volume of
> the room to get the correct Rt (reverberation time re 60dB), so as to
> minimize reliance on fixed absorption. The Albert’s Rt was targeted to
> be between 1.2 and 1.6 seconds. While a broad range, ideally it would
> lean towards the 1.6 end. It was explained that you can have good
> clarity at 1.6 seconds if there are strong early reflections in the 20
> to 50ms range. A question was asked about the spectral balance of the
> Rt, to which Dr. Madaras responded that he generally looks at Rt on an
> octave-by-octave basis. It is usually best when the Rt increases 5% per
> octave as you go down for a typical theater, with up to a 15% increase
> per each descending octave for a purely musical space. He prefers 275 to
> 325 cubic feet of volume per patron for a typical drama venue. He
> explained, for instance, that he would recommend lowering the ceiling if
> the theatre started at 400 cubic feet per seat. If that were not
> possible, one would have to use “lots” of fixed absorption. If you can
> get the right volume and right ceiling height, then no ceiling
> absorption is required, or even desirable.
>
> A question was asked about low frequency absorption. Since the ceiling
> is two layers of gypsum, wouldn’t that allow low-frequency energy to
> pass? The response was that indeed, that is the case. It was explained
> that low-frequency energy usually needs to be reduced, so this was not a
> problem. In venues with a 6” or 12” concrete ceiling, there is typically
> too much low-frequency energy.
>
> This report will conclude with a brief description of the mechanical
> isolation of the Albert, as the building is mechanically separate from
> the site on which it was built. With structural breaks around, even the
> HVAC is directed through acoustic plenums - from a building rooftop
> behind the theater stage. An RC20 curve was the goal, and was probably
> met. There is a subway that goes beneath the smaller stage, so noise
> isolation was particularly challenging. To explain the isolation, we
> were asked to imagine a concrete grid with pylons 3’wide by 4’deep. At
> many of the intersections, place natural rubber blocks 2’x2’x8” with a
> 1” steel plate imbedded in them. Then float another 3’x4’ concrete grid
> on this, and build the new slab. This tends to avoid the transmission of
> mechanical vibration from the L’s and subways. The resulting noise
> isolation was better than anticipated, and the rumbling of a subway is
> almost undetectable.
>
> In light of the mechanically isolated “floating theatre,” it was rather
> ironic that on opening night, the play called for a background of “city
> noise.” A recording had to be played back through the sound system as no
> actual “city noise” was making it past the isolation!
>
> About this Month’s Speaker
> D. B. Keele: As of April, 2001 Don Keele has worked for a number of
> audio related companies in the area of loudspeaker R&D and measurement
> technology including Electro-Voice, Klipsch, JBL, and Crown
> International. He holds three patents on "constant-directivity"
> loudspeaker horns and is a fellow of the Audio Engineering Society. For
> 11 years he wrote for Audio Magazine as a Senior Editor performing
> loudspeaker reviews. He recently joined Harman-Motive as a Principal
> engineer in the advanced product engineering group. Mr. Keele holds two
> BS degrees in electrical engineering and physics and an MSEE degree from
> Brigham Young University. He has presented and published a number of AES
> technical papers on loudspeaker design and measurement techniques and
> has also written many magazine articles. He is a frequent speaker at AES
> section meetings and workshops, has chaired several AES technical paper
> sessions, and is a member of the AES review board. Mr. Keele is a past
> member of the AES Board of Governors and is past Vice President, Central
> Region USA/Canada of the AES. Mr. Keele recently received the 2001 TEF
> Richard C. Heyser Award.
> Upcoming Meetings
>
> October 10, 2001 – D. B. Keele – The EIA-426-B Loudspeaker Power Rating
> Compact Disc. What's on it? How do I use it?
>
> March 12, 2002 – Bob Adams – Acoustical Implementation in the Real World
>
> AES Chicago Section
> October Meeting Summary
>
> What: The EIA-426-B Loudspeaker Power Rating Compact Disc. What's on it?
> How do I use it?
> Who: By D. B. Keele of Harman/Becker Automotive Systems.
> When: Wednesday, October 10th, 7:30 PM
> Where: Holiday Inn North Shore, Skokie
>
> Robert Zurek
> AES Chicago Section Secretary

Alvin Foster wrote:

> BOSTON  AUDIO  SOCIETY
>
> September 2001, Meeting
>
> Date:  Sunday, Sep. 23
> Time: 6:00 PM
> Place: Room 120
>  National Transportation Systems Center
>  55 Broadway, Cambridge, MA
>
> Sub: Audio Forensics
>
> Featured Guests: Robert Berkovitz, Sensimetrics Corporation
>
> Robert Berkovitz will present a discussion of audio forensic work.
> Sensimetrics Corporation, of which he is a founder with several MIT faculty,
> specializes in speech and hearing research. They began accepting forensic
> work as a sideline and have continued to take cases where the corporation's
> abilities are especially useful. They do no solicit such work.
>
> If you are old enough, you most likely remember the '18 ½' minutes missing
> from President Nixon's White House Watergate tapes. It is the job of the
> audio forensics expert to reconstruct the missing data from like sources for
> legal purposes.
>
> Audio forensics is used in many applications. Emergency calls to 911 often
> become evidence in court. The calls, and events taking place in the
> background, often are critical evidence, too, and must often be identified
> or transcribed. "We do not solve crimes, so I would not want it said that we
> do." Mr. Berkovitz will give us a peek into the type of forensic work done
> on tape recordings when they become important in courtrooms. Rather than
> find the name of a caller, the Sensimetrics Corporation's staff is often
> called upon to examine similarities and differences in the voices of
> possible callers, to suggest the most likely caller among a group of
> candidates.
>
> To aid his lecture, Mr. Berkovitz will use video and audio playback devices.
> He will come supplied with tapes and videos to give us a peek into the world
> of solving crimes the 'audio way'. In the past, court evidence complied by
> the Sensimetrics Corporation's staff has gotten innocent people out of jail.
> Another use of audio forensics is finding out the name of the caller who
> left a bomb threat on an answering machine or the irate employee who
> anonymously tells his boss that he is going to hurt him/her.
>
> Some well known national cases will be presented to members of the society.
> We will become a part of analyzing the 'who-done-it'. A lively discussion
> will follow each presentation.
>
> DIRECTIONS
>
> By car:   Coming from Boston take the Longfellow Bridge over the Charles
> River onto Broadway. Turn right, at the first light, onto Third Street and
> then take the first left  (Potter Street if the sign is posted). Go down a
> couple of hundred yards and park near the loading dock area on the left.
> Walk down the path to the left of the loading area into the courtyard; enter
> the door on your right, and sign in at the guard station inside.
>
> By MBTA: Take the Red Line to Kendall Station and walk through the Cambridge
> Marriott Hotel to Broadway. Cross the street and walk just to the right of
> the building into the courtyard; the door with the guard station will be on
> your left.
>
> BAS FUTURE MEETINGS
>
> August -- No BAS Meeting
> Richard Goldwater -- To be announced
> Victor Campos - March 2002
>
> AES FUTURE MEETINGS
>
> September 11 - BB&N, Mark of the Unicorn, a software & hardware solutions
> company www.bostonaes.org
>
> ACOUSTICAL SOCIETY OF AMERICA
>
> September 18 - 7:00 PM will meet at Berkley College of Music,
> 'Extraterrestrial & Underwater Acoustics, www.gbcasa.org
>
> PRESIDENT'S MESSAGE
>
> 0.  Mostly for Boston area members:  To ensure reliability comparable (?) to
> postal meeting notices, we decided to set up a dual email meeting notice
> system.  Alvin Foster sends #1 first; I send #2 shortly before the meeting
> with any last minute additions or corrections.  If you are receiving one and
> would like to receive two, email either Alvin (for #1) at amfmail@... or
> me (for #2) at dbsystems@... mistake, the mailed notice and
> #1 email message for July were repeated from June.  #2 was correct.  The
> August message was only emailed since there was no meeting.  All are on our
> website.
>
> 1.  There is an enhanced version of MP3 encoding, said to give the same
> quality at 64 kbps as regular MP3 at 128 kbps.  It is called mp3PRO.
> www.rca.com
>
> 2.  A recent PBS show "The Russian Trinity" provided a fascinating look at
> the old Soviet Union and the relationship between Stalin, the secret police,
> and the Bolshoi Theater; and a cautionary tale for those that want more
> government support of the arts.  After the revolution, the Bolsheviks wanted
> to close the theater and raze the building as a symbol of the decadent
> Tzarist regime, but Lenin pushed to save it.  He had no interest in the
> arts, but needed the Bolshoi to legitimize the communists and provide a
> showplace for visiting dignitaries. One story:  The conductor Samosud was
> leading an orchestral performance and at intermission, Stalin called him
> into his box.  Stalin said he liked the performance, but thought it needed
> more music in the minor mode.  Samosud said, "Can we extend the intermission
> 15 minutes?  I will ask the musicians to write in some music in the minor
> mode."
>
> 3.  Frank Beacham writes in TV Tech about preserving the video legacy.  CNN
> is embarking on a $20 million project to digitize its videotape library.
> Curiously, the article doesn't say what the medium is.  He says "Unlike
> optical motion picture film--which can last for decades--videotape is not a
> good archival medium."  If that were true we would be archiving video on
> magfilm.   Cellulose acetate film doesn't last as long as video polyester
> tape-- it's how the information is stored that's the difference.  Optical on
> film is analog and can withstand considerable degradation without losing the
> image.  Video is more like digital in that after a point the image is lost
> entirely.  If film is damaged at one spot, one frame is lost, whereas with
> videotape there will be picture distortion for 10 seconds or more because a
> frame is spread over several inches of tape.  (In 1950 Swedish Radio
> archived an historic performance of the German Requiem, conducted by Wilhelm
> Furtwangler, by copying the magnetic tapes onto acetate discs.
> Unfortunately, they then erased and reused the tapes.  However, at that
> time, the life expectancy of magnetic tape was unknown, whereas with
> reasonable care, discs were known to last indefinitely). Sony stated 10
> years ago that the life of videotape was 15 years when "stored properly,"
> meaning 59 to 77 degrees F and 40 to 60% relative humidity. In "Saving Film
> History", Eric Rudolph writes that Universal is now storing its film masters
> at 34 degrees F and 25% humidity, saying that higher numbers used in the
> past were a mistake.  He quotes the American Film Institute as saying that
> 90% of films made before 1950 have been lost.  But in many cases "the
> studios killed them" by simply getting rid of their oldest films when the
> storage vaults were declared full. [American Cinematographer, Ja01]
>
> http://bostonaudio.home.att.net
>
> The Boston Audio Society
> POB 211
> Boston, MA  02126
> Tel: (603) 899-5121

> If you can.....
>
> 10:30 EASTERN TIME.... 9:30 Central, 8:30 Mountain, 7:30 Pacific
> I  just heard on the radio that the U.S. has asked that everyone step
>  out on their lawns tonight at 10:30 ET and light a candle.  They will be
> taking a satellite picture of the U.S. and posting it on the news tomorrow
> morning. Please pass this on to as many people as possible.
>

> Would anybody happen to know where I can find an equation to convert an
SPL
> reading to a PEAK static pressure?

94dBSPL=1Pa (rms).  If the SPL is a single tone (sinewave),  take your SPL
and subract 94.  Then divide by 20.  Then, take 10^ that power.  That gives
you the pressure rms in Pascals.  Peak is 1.414 times that.

If the SPL is not a single tone, then you can't get there, there's not
enough information (would need to know magnitude and phase of every separate
component)-- could be about anything.

---On an unrelated note:---

For those who may not have noticed, I am not responding to email to
bwaslo@... anymore.... it gets a stupid amount of SPAM now (I've deleted
over 800 garbage messages tonight!), and I need to spend any time I can
scrape together on getting Praxis ready for prime time instead.   Support
calls can still be handled via phone (or preferably, fax).  {I don't
consider lauduserlist to be spam, by the way... I'm referring to all the
great announcements for viagra, business opportunites, debt relief, porn,
etc., which have made email such a quagmire}.

When I get out of software development mode, I'll set up a new email address
(not so easily identified as such on our webpage, to hide from spambots!).

But please don't call or fax about praxis price/ availability/ capability/
compatibility/ formatability yet, I'm just not able to deal with those yet
and can't give any useful answers at this time.  It has been (still is) a
very difficult development and is constantly being pre-empted by other
demands on time.  Its getting close, but still is not quite imminent.

Sorry if I seem like a recluse or curmudgeon, I'd really prefer to talk
about audio stuff instead.  But won't be able to be in business to do that
again,  unless I can hide a bit longer!

Thanks for your patience,

Bill Waslo
****************************
Liberty Instruments, Inc.
www.libinst.com
*************************************************
*Please Note!: My email is not checked on an ongoing basis.
*If prompt response is required, a faxed message is recommended
*(fax: 513 755 0252).  Due to time constraints and the volume of
*email received (this email address gets spammed
  mercilessly!), response to email WONT HAPPEN!
********************************************************


----- Original Message -----
From: <audionuttt@...>
To: <lauduserslist@yahoogroups.com>
Sent: Monday, 10. September 2001 12:00 PM
Subject: [lauduserslist] SPL


> All,
>
> Would anybody happen to know where I can find an equation to convert an
SPL
> reading to a PEAK static pressure?
>
> Thanks
>
> Deon

David Carlstrom wrote:

> Can anyone help Nick?
>
> ----- Original Message -----
> From: "Nick Oppermann" <nicopp@...>
> To: <djcarlst@...>
> Sent: Thursday, September 27, 2001 5:24 PM
> Subject: DAT HELP
>
> > Hello ---
> > My father, Pat Oppermann, was a devoted member of your fine club and was
> > as enthusiastic about his membership there as any other group he was
> > associated with. Your members were kind and helpful when it came time to
> > find homes for some of his recordings and equipment. I am now asking for
> > another favor:
> >
> > His proudest possession at the time of his death 4 years ago was his
> > Panasonic SV 255 DAT recorder. He used it to record my brother's and my
> > band, the New Reformation Band, many times. I would like to continue to
> > use the recorder for the same task. My problem is that I can find no
> > power source --- either battery or AC adaptor. Nor do I have any
> > instruction book. The good people at Panasonic have declared the machine
> > obsolete. "After all, Mr. Oppermann, that recorder was made back in
> > 1989!" Oboy. Anyway, my dad knew his recording gear pretty good, and he
> > sure thought a lot of his SV 255. I hate to discard it. I'm sure its a
> > fine piece of equipment, but I don't know where to go next. I sure hope
> > one or more of your members can offer me a tip or two. Thanks for
> > listening.
> > Nick Oppermann
> > 1893 Avalon
> > Saginaw MI 48603
> > 989-797-2193
> >

I'm a bit confused about the readings that I get when measuring the
Theil Small parameter of my speakers.  I have read the previous post
on this group which are very helpful and answered alot of questions,
but I still need advice on the levels that the measurements need to
be made at.
I have been working with Vifa M13 5" midbass units and have seen
variations of the Fs from 65 to 95 Hz.  Using the Sine instrument
seems to produce lower Fs that the MLS instrument at equal drive
levels.  With both instruments the Fs will decrease as the drive
level increases.  So it would seem that the driver has different Fs
depending on the level it is driven at.  Is this as it should be?

What levels do you use when measuring the T/S parameters in your
systems?

I know from reading that the T/S parameters should be "small
signals", but the results I get at these levels dont compare well
with results that others have published.  At low levels I get an Fs
of 95 hertz, but on the North Creek Web site the published average
they get is around 75 Hertz, while Vifa publishes 65 hertz for Fs for
this driver.

I would appreciate any help you can give.

Thanks,

Tim

Hello:

If anybody is interested, I am selling my LAUD setup.  I have a
registered version of LAUD.  The software is version 1.16.  The sound
card is the Orchid SoundWave 32 which uses the appropriate DSP chip.

You can see a picture of the card and software at:
http://www.alternate-audio.com/ebay/laud.jpg

I also have printed version of the LAUD manual, Orchid manuals and
install floppies.  I am the original purchaser of LAUD, so I can
assist in transfer of license if necessary/possible.

Please reply to dpatten@... (I check this email
address more often).  I would like to get $150 OBO [grin].

Thanks

Dan

PSACS will next meet Saturday, October 20, 2001, 2 PM, at the home of:

Martin King
2647 Longview Dr.
Lisle, IL  60532    (630-983-6327)     alivenwell@...


MEETING TOPIC:

----------

"Subjective Listening"  by Tom Nousaine


----------

See
http://clients.mapquest.com/netscape/mqtripplus

Or go with Martin's directions:

Getting here is very easy: Locate the I-355 / I-88 interchange in DuPage
County in the far Western burbs. Proceed West on I-88 past Lisle to the
Naperville Road exit. Go straight South on Naperville Road to Abbeywood
Drive. Turn left and Longview is the 2nd street on the right. 2647 is a two
story white house with a red brick front. The phone is 630-983-6327 if
anyone gets lost.
Only confusing parts: Naperville road morphs into Naper Blvd somewhere just
before it crosses Ogden Ave. Just remember to stay straight, and not curve
off to the right. Look for the Ford dealer, Bob Evan's restaurant and a Mobil
station at the corner of Ogden and Naper. Follow Naper under the railroad
tracks and keep going South. The next big intersection you cross is Maple
(aka 55th, aka Chicago Rd). There will be a White Hen on your right and
apartments on your left. Just keep going straight. Abbeywood will be the
first street you come to on the left after you cross Maple and get beyond
the apartments. It's the street you turn onto for the baseball diamonds (aka
Surrey Ridge Athletic Complex). Since Abbeywood dead ends into Naper, there
is only one way to turn (East). Longview is a short little loop on the South
side of Abbeywood just beyond the baseball fields. Both ends of it dead end
on Abbeywood, so "you can't miss it"...

----------
Meeting Description:

Tom Nousaine will talk about Subjective Listening,  not the
psuedoscience kind, but a method based on science and
reality, similar to the standard AES20-1996.

See: http://www.aes.org/standards/reports/AES-STANDARDS-IN-PRINT.html
or
http://global.ihs.com/doc_detail.cfm?COUNTRY_CODE=US&LANG_CODE=ENGL&document_nam\
e=AES20

----------

Future Meetings:

December 2001 --- Arny Krueger, co-inventor of the ABX switchbox, will talk
about
a variety of issues. First, his discovery that amplifiers can sound
different than a
straight wire. He will also talk about computer sound cards and the
new 24/96 digital audio formats.  You can hear some of these things for
yourself (or not
be able to hear them at all!!) on  www.pcabx.com. His computer/sound card
web site is www.pcavtech.com

February 2002 --- Perry Sink will give a seminar on loudspeaker design,
driver design,
and speaker modifications.

April 2002 --- Madisound Scratch and Dent Sale.

June 2002 --- Don Keele will talk about loudspeaker power ratings.


----------

Martin King comments on the October meeting:

Re the PSACS program, the new baby has forced my gear into storage. Not that
it matters, since I don't have any "audiophile grade" stuff anyway. However,
if anybody is up for a nostalgia trip, I do have a pair of Bose 901s and a
pair of AR-3's in excellent working condition that I could drag out. Both
came with cloth roll surrounds and have thus escaped the dreaded scourge of
foam rot. The 901's are the original air suspension series 1 version, which
used CTS OEM drivers. The AR-3s were made in 1958, and have been playing
ever since. Difficult to believe AR used to stage successful "live vs.
recorded"
challenges with them...

Also available for the meeting are a pair of Carver's Platinum IV "Amazing
Loudspeakers", which came from the very last production run before Carver
left the company and the line was shut down for good. This is a design after
your own heart: a two-way speaker using a five foot ribbon crossed over to a
line array of four 12 inch woofers at 125 Hz. Plus there is a Henry Kloss
designed CSW model 11 stereo in a briefcase, and I recently added his CSW
model 88CD table radio. The latter is Henry's answer to the Bose Wave
Radio...

My electronics are all ancient solid state dreck ( Dynaco 120, Phase Linear
700, etc.), so here is a chance for your Macro Reference to strut its stuff
with the Carver ribbons...

Martin King

(Ed: Tom Perazella will bring his Crown Macro Reference amp.  That ought to
light
a fire under those Carver "Amazing" loudspeakers!!)

----------

Meetings will continue to cost $5 per person for members and groupies.
Meetings are free for guests, presenters,

AND ANYONE WHO WILL HELP ME WITH THE NEWSLETTER, MEETING NOTICES,
AND/OR WEB SITE

MEMBERSHIP and NEWSLETTER: There are no longer any "membership"
fees.  These used to be for receiving the meeting notice, which is
now a moot point because of the Internet.

Sound Bytes is published bi-monthly. Subscriptions to the newsletter
are now $15 per Calendar Year, which
runs from January to December, covering one complete year of Sound
Bytes, six bi-monthly issues, beginning with the February publication,
the first issue of the year. Back issues will be supplied beginning with
the February issue to anyone joining in mid year. Other back issues are
$3 each, $15 for a complete set.

Four issues are still due for the 2000  subscriptions. The 2001 newsletter
subscriptions will start after those 4 issues.
--------------------
We now ask for $7 a year for a printed meeting notice. Printed meeting
notices will be sent only to those who request one. If you want a
printed meeting notice, you MUST pay $7.
E-mail notices are free of charge.

The future web site will contain the latest meeting information. Please
send me your e-mail address to activate your free e-mail notice.

Please make checks payable to Michael Sims. Send all money, membership
dues, articles, ideas, sale items, questions, or insults to:

PSACS
Michael Sims
2711 Bartlow Rd.
Urbana, IL 61802    217-384-2073    m-sims1@...

WHO ARE WE?
The Prairie State Audio Construction Society is an Illinois based group
of dedicated music lovers who's
motto is "Truth In Listening". Founded in 1990, the purpose of the club
is to explore the aspects of audio reproduction that
result in the greater enjoyment of music. Activities span the range
from visits to manufacturers of audio equipment,
demonstrations of professional test methods conducted by leading
manufacturers, analysis of home construction projects,
blind testing of competitive products and technologies, and social
gatherings.
Members of all levels of involvement are included. From persons
just discovering the magic of high quality sound, to
seasoned professionals who have done much research and who have
published in most of the Audio journals, all contribute
to an atmosphere of enthusiasm and just plain fun.
The common theme of the club is "What makes it sound better". Is
there a basic technological advantage to a particular
design approach? Does the selection of components or the construction
method make a difference? Are particular parts of
the audio chain more important than others? Does "Tweaking" make a
difference? Are there high value pieces of
equipment available? Are there high cost traps to fall into that make
no difference in the sound? These are just a few of the
questions addressed through the many activities of club members. The
word construction is indicative of the many members
who actively participate in the construction, and many times the actual
design of their equipment. Projects that have been
completed and shared with other members include all types of speakers,
pre-amplifiers, amplifiers, custom crossovers,
speaker protections devices, soft start and surge protectors, custom
furniture, and other audio components. For those not
interested in construction, as much time is spent investigating the
options in commercially available equipment. Some of
the tests of commercially available equipment have become feature
articles in major magazines.
PSACS meets every second Saturday of even numbered months, with
occasional exceptions. PSACS meetings feature
audio construction, design analyses, blind listening tests, equipment
clinics, autosound, home theater, lectures from
manufacturers and reviewers, as well as field trips to manufacturing
plants and audio businesses. PSACS is pronounced "pea-sacks".



EQUIPMENT SWAP: Bring stuff to sell or trade!
Well, All Rightee Then!!!

Perceived, prepared, produced, published and perpetrated by Michael Sims

Hi,
I tried to send this message to unsubscribe address, but as I thought it is
automated.
My old email address went south on me and my ISP has no fix (or
understanding why it quit).
Since it no longer works I can't unsubscribe my old email membership to the
list.


I just joined today with-
clist48722
clist@...

My old address was-
clist@...
and I am not sure what my user name was.

I need you to unsubscribe the old subscription with the "pop" in it and let
me know you managed it. Thanks.

PS-don't you just love progress


Too-Tall
	                       Curtis H. List
			         Bridgeport, Mich.
	                       I.A.T.S.E. Local # 274 (Gold Card)
	                       Lansing, Mich. local
		               http://my.voyager.net/~iatse274/

	             	   Independent Live Sound Engineer (and I'm Tall Too!)

David Carlstrom wrote:

> 160 TH  SMWTMS MEETING DETAILS
>
> DATE:  Saturday  November 10, 2001
>
> TIME:  2 PM Until ?
>
> FORMAL MEETING:  4 PM
>
> COHOST: Duane Mitchell
>
> HOST: Tom Nousaine
> 4296 Ridge Drive
> Pinckney MI 48169
> 734-878-4794
>
> LECTURE: An Asymmetric Baffle for the Bohlendher Graebener RD75 Planar
> Magnetic Driver. Tom Perazella will speak on the construction of an
> asymmetric dipole baffle. The Bohlendher Graebener RD75 is a 75" long planar
> magnetic driver that can be used in both monopole and dipole configurations.
> Tom will cover research examining the advantages provided by baffle
> asymmetry when using a tall line driver in room.  The choice of this driver
> and of some unique materials and construction techniques will be covered.
> Description and photographs of the construction will be shown.  Performance
> measurements will be included. The audible consequences of a quality control
> problem with the drivers discovered during initial testing and the solution
> will be covered.  The integration of the finished dipoles with bass and sub
> range speakers will be discussed.  In addition to the presentation, Tom will
> provide his opinions of the driver after extended listening, including his
> personal and unsubstantiated reasons for the sound characteristics of this
> driver/baffle configuration.
>
> HOST SHOW OFF:  Tom Nousaine will have new stuff to show off!  A new Sharp
> XV-Z9000U dlp projector; Lexicon MC-12 processor, DirecTv High Definition TV
> and "maybe" DVD-A.
>
> HOST ASSIGNMENTS:  Please check your host and co-host assignments below.
> Note that assignments are made to give hosts and cohosts fair warning.  In
> spite of the appearance of rigidity, the schedule is flexible.  Volunteered
> changes are welcome.  If you have a suggestion, do not hesitate to offer it.
> Contact David Carlstrom with your ideas.
>
> CALENDAR:  DATE / PROGRAM / HOST   / CO-HOST:
>
>   1/19/2002 / ???   / Tony Henrichs  / Tom Gilmore
>     3/9/2002 / ???   / Dennis Green  / Fred Bruflodt
>   5/11/2002 / ???   / Ray Kilmanas  / Gerald Verbaan
>   7/13/2002 / Trunk Sale  / Steve Maki  / Art Greenia
>   9/21/2002 / Autosound  / DLC Design  / Cliff Merz
>   11/9/2002 / ???   / David Carlstrom / Richard Green

Alvin Foster wrote:

> BOSTON  AUDIO  SOCIETY
>
> November 2001, Meeting
> Date:  Saturday, Nov. 17 Ü
> Time: 2:00 - 6:00 PM
>
> Place: At the home of:
>
> Richard Goldwater, MD
> 1 Wayne Rd.
> Newton Center, MA 02459
>
> Subject: 17.3 Channels of Audio + Large Screen Video, 6-Channel DVD Audio
> ------------------------------------------
>
> Featured Guests: Dr. Richard Goldwater, Psychiatrist and Serious Audiophile
>
> Our November meeting will be held at the home of Richard Goldwater,
> long-time BAS member and former co-host of Shop Talk. At the meeting,
> Goldwater will demonstrate and explain why he prefers 17.3 channels of
> discretely derived audio, the advantages of DVD Audio vs. 5.1 vs. AC-3 5.1,
> SCAD, and you will have an opportunity to view Sony's best 3-tube, big
> screen TV. My sessions with sound and pictures demonstrate that it's true,
> hi-definition video/pictures do make the audio sound better.
>
> Even though I have been privileged to attend many CES grand presentations
> all proclaiming the advantages of multi-channel sound (DVD Audio, SACD, 5.1,
> etc.), it was Richard's presentation that taught me the most about
> 'envelopment', the missing element in stereo's 2-channel presentation.
> Envelopment captures the essence of the hall's character and the sense of
> 'space' that surrounds the listener.  David Griesinger, Lexicon Corporation,
> has lectured the BAS on how to get it and maintains that it can only be
> maximized through the multi-channel approach. Goldwater has 17.3 channels of
> speakers placed meticulously around the room. He has so many remote controls
> that a large, nearby coffee table cannot hold them all.
>
> BAS members are encouraged to bring along their favorite CD and DVD movie.
> After the BAS 'Open Session,' groups will be directed to the listening room
> where their CD will be played back after various multi-channel formats are
> demonstrated. Afterward, Richard will explain the room's great sound
> treatment and why he needs bass speakers the size of a Volkswagen Beetle.
>
> DIRECTIONS
>
> By car:   If traveling on Rt. 9, turn onto the Hammond Pond Pkw South,
> located near Barnes & Noble & across from Bloomingdale's at the Chestnut
> Hill Mall. Travel about a mile. At the rotary, make an immediate right turn
> onto Newton St (becomes Brookline St at the Newton line). Make a left turn
> onto Vine St (approximately third left), go down hill; 11 Wayne Rd is the
> third right turn off Vine St. If traveling from  the VFW Pky North, make a
> left onto Lagrange St. At the intersection of Corey St (on the right) and
> Vine St, turn left onto Vine. Travel one block through a wooded area; then
> turn left onto Vine St.
>
> By MBTA: Take the city bus that runs along Rt. 9. Exit at Hammond Pond Pkw
> and phone, (781) 239-8850. See directions above for more details.
>
> BAS FUTURE MEETINGS
> December - White Elephant Sale
> Victor Campos - March 2002
>
> AES MEETINGS
> November 14 - 2001 Parsons Expo, Wellesley Community Ctr, Noon-9:00 PM, Free
> lectures & demonstrations, www.paudio.com
>
> ACOUSTICAL SOCIETY OF AMERICA
> November 13 -- a tour and discussion of Acoustical Design Issues at the BU
> Photonics Center, www.gbcasa.org
>
> ----------------------------------------------------------------
> PRESIDENT'S MESSAGE
>
> 1.  Craig Anderton reviews "Izotope Vinyl", billed as the ultimate weapon
> against HiFi.   It "vinylizes" your pristine audio through parameters for
> turntable rumble, electrical noise (hum), record wear, amount of dust,
> scratches, warping amount (including edge warps), and six choices of record
> player vintage from 1930s phonograph to 1980s linear-tracking turntable.
> Anderton notes that the scratch is the least convincing of the effects, at
> least at low levels, but at high levels it's fine.  And it's free.
> www.izotope.com [EQ JY01]
>
> 2.  Five major movie studios have anounced plans to allow computer users to
> download rental copies of feature films over the Internet.  A spokesman said
> the average film is about 500 megabytes in digitized form and would take 20
> to 40 minutes depending on the type of broadband (high speed) connection.
> Once you start watching the movie you have unlimited use for 24 hours, then
> it erases itself.  [I guess they like the idea of eliminating the middleman.
> The file size is not enough for HD or even DVD quality.  One wonders who
> would be interested].  NYT 17Au.
>
> 3.  Herve Deletraz's Stereophile piece on audio cables as transmission lines
> (Nv01), while being thorough and mostly accurate, is completely irrelevant
> to home systems.  A rule of thumb is that transmission line effects become
> important when the distances involved are more than a quarter wavelength--in
> the case of of 5 kHz transmitted electrically, about 10 kilometers, not a
> typical system cable run.  His recommendation to load outputs with 250 ohms
> (which is an atypically high value for coaxial cable impedance) is really
> pernicious--doing so will cause bass rolloff and overload distortion with
> just about every piece of equipment (the IHF minimum load is 10 kohms).
> People will hear a difference, but it is due to distortion.
>
> He calls a 10 kHz square wave signal "audioband", saying even older people
> can hear it.  No human being on Earth can hear a 10 kHz square wave--only
> its 10 kHz fundamental sine wave can be heard.  A  500 Hz square wave would
> be a reasonable simulation of music--using 10 kHz pushes his argument
> further into the realm of absurdity.
>
> His use of the term "echos" is also misleading, implying an audible delayed
> sound.  In fact due to the Haas Effect, signals arriving less than 25
> milliseconds after the original sound are heard as part of the initial
> signal, and not an echo.  His examples show 1 microsecond delayed
> reflections due to 100 meter cables!
>
> He says "what we take as being due to high-frequency attenuation [of the
> square wave] is, in fact, the superimposition of multiple echos...".  With a
> typical cable capacitance of 60 pF/ft, a source impedance of 250 ohms will
> cause a -3 dB point of 35 kHz--which easily explains the rolloff.
>
> Referring to figure 11 he says that the resistors in each leg of a balanced
> system should be the same as the cable impedance, but in fact they should be
> 1/2 the cable impedance.
>
> http://www.bostonaudiosociety.org

PSACS will next meet Saturday, December 8 , 2001, 2 PM, at the home of:

Marty Daley
319 S. Kensington Ave.
LaGrange IL 60525       708-482-0372

Everyone is Welcome!!!!!!

MEETING TOPIC:
   ------------------------------------------------------------------------
"Sound Cards, PC recording, Amplifier Differences, and ABX for your
PC!!"
     by Arny Krueger
   ------------------------------------------------------------------------

Directions:
  http://clients.mapquest.com/netscape/mqinterconnect?
screen=map&link=map&city=LaGrange&event=
zoom&height=283&lat=418084&lng=-878743&orig_lat
=418084&orig_lng=-878743&orig_name=
319%20S%20KENSINGTON%20AVE&si=2&so=
1&ss=1&state=IL&streetaddress=319%20s.%20
Kensington%20Ave&width=387&x=29&y=
13&level=7&event=zoom


MEETING DESCRIPTION::

Arny Krueger, co-inventor of the ABX switchbox, will talk
about a variety of issues. First, his discovery that amplifiers can
sound
different than a straight wire. He will also talk about computer sound
cards and the
new 24/96 digital audio formats and how they are used in
audio recording on the PC.

His computer/sound card web site is   http://www.pcavtech.com

You can hear some of these things for yourself
(or not be able to hear them at all!!) on    http://www.pcabx.com ---
his web site for doing double blind tests on your PC!!

FUTURE MEETINGS:

February 2002 --- Perry Sink will give a seminar on loudspeaker design,
driver design, and speaker modifications.

April 2002 --- Madisound Scratch and Dent Sale.

June 2002 --- Don Keele from Harman International
will talk about loudspeaker power ratings. Don was senior speaker
reviewer for Audio magazine for many years.
   ------------------------------------------------------------------------

Meetings will continue to cost $5 per person for members and groupies.
Meetings are free for guests, presenters,

AND ANYONE WHO WILL HELP ME WITH THE NEWSLETTER, MEETING NOTICES,
AND/OR WEB SITE

MEMBERSHIP and NEWSLETTER: There are no longer any "membership"
fees.  These used to be for receiving the meeting notice, which is
now a moot point because of the Internet.

Sound Bytes is published bi-monthly. Subscriptions to the newsletter
are now $15 per Calendar Year, which
runs from January to December, covering one complete year of Sound
Bytes, six bi-monthly issues, beginning with the February publication,
the first issue of the year. Back issues will be supplied beginning with

the February issue to anyone joining in mid year. Other back issues are
$3 each, $15 for a complete set.

Four issues are still due for the 2000  subscriptions. The 2001
newsletter
will probably go to an E-newsletter and web site, with optional printed
copies for a small fee.
--------------------
We now ask for $7 a year for a printed meeting notice. Printed meeting
notices will be sent only to those who request one. If you want a
printed meeting notice, you MUST pay $7.
E-mail notices are free of charge.

The future web site will contain the latest meeting information. Please
send me your e-mail address to activate your free e-mail notice.

Please make checks payable to Michael Sims. Send all money, membership
dues, articles, ideas, sale items, questions, or insults to:

PSACS
Michael Sims
2711 Bartlow Rd.
Urbana, IL 61802    217-384-2073    m-sims1@...

WHO ARE WE?
The Prairie State Audio Construction Society is an Illinois based group
of dedicated music lovers who's
motto is "Truth In Listening". Founded in 1990, the purpose of the club
is to explore the aspects of audio reproduction that
result in the greater enjoyment of music. Activities span the range
from visits to manufacturers of audio equipment,
demonstrations of professional test methods conducted by leading
manufacturers, analysis of home construction projects,
blind testing of competitive products and technologies, and social
gatherings.
Members of all levels of involvement are included. From persons
just discovering the magic of high quality sound, to
seasoned professionals who have done much research and who have
published in most of the Audio journals, all contribute
to an atmosphere of enthusiasm and just plain fun.
The common theme of the club is "What makes it sound better". Is
there a basic technological advantage to a particular
design approach? Does the selection of components or the construction
method make a difference? Are particular parts of
the audio chain more important than others? Does "Tweaking" make a
difference? Are there high value pieces of
equipment available? Are there high cost traps to fall into that make
no difference in the sound? These are just a few of the
questions addressed through the many activities of club members. The
word construction is indicative of the many members
who actively participate in the construction, and many times the actual
design of their equipment. Projects that have been
completed and shared with other members include all types of speakers,
pre-amplifiers, amplifiers, custom crossovers,
speaker protections devices, soft start and surge protectors, custom
furniture, and other audio components. For those not
interested in construction, as much time is spent investigating the
options in commercially available equipment. Some of
the tests of commercially available equipment have become feature
articles in major magazines.
PSACS meets every second Saturday of even numbered months, with
occasional exceptions. PSACS meetings feature
audio construction, design analyses, blind listening tests, equipment
clinics, autosound, home theater, lectures from
manufacturers and reviewers, as well as field trips to manufacturing
plants and audio businesses. PSACS is pronounced "pea-sacks".



EQUIPMENT SWAP: Bring stuff to sell or trade!
Well, All Rightee Then!!!

Perceived, prepared, produced, published and perpetrated by Michael Sims

David Carlstrom wrote:

> http://users.htdconnect.com/~djcarlst/aes_next.htm
>
> Speaker:
> Floyd E. Toole, Vice President of Acoustical Engineering, Harman
> International Industries, Inc.
>
> Topic:
> Audio Engineering - Science in the Service of Art
>
> ABSTRACT:
>
> Audio engineering, whether it is in a recording studio or a product design
> lab, is motivated by a love of music, and directed towards providing moving
> and memorable listening experiences. Art is the alpha and omega of audio,
> but the capture, storage and reproduction of the art are complex technical
> exercises. Physical science underpins the devices, signal processing and
> acoustical expertise necessary to do it well. Physical measurements are
> essential in the design of audio devices, but it is the interpretation of
> the technical data that has been the greatest challenge to progress. The
> transformation of listening tests into subjective measurements has been
> central to advances in the science of audio, which, as a result, is now
> better able to serve the art. When we look at the sequence of events in the
> capturing, storing and reproduction of the audio arts - music, film sound,
> etc. - it becomes clear that loudspeakers are not the weakest link. Rather
> it is the complex interface between the loudspeaker, room and listener that
> is responsible for most of the 'distortion' of the art. We, as an industry,
> need to improve our practices in studios and in homes.
>
> SPEAKER:
>
> Floyd E. Toole is corporate vice president of acoustical engineering for
> Harman International Industries, Inc. Dr. Toole is noted for his research on
> the acoustics and psychoacoustics of sound reproduction, conducted during
> his 25-year tenure at Canada's National Research Council. At Harman since
> 1991, Dr. Toole oversees the product engineering and evaluation processes.
> Widely published in scientific journals and popular magazines, he is an AES
> Fellow, Publications Award winner, Past President and Silver Medal
> recipient.
>
> Date and Time:
> 7:30 PM, Monday, December 10, 2001
> Location:
> Panasonic, 26455 American Drive, Southfield MI, 248-447-7000. Panasonic is
> in the American Center area, south of I-696 and west of Telegraph. American
> Drive runs north from Eleven Mile between Telegraph and Inkster and west
> from Franklin Road between Eleven Mile and Northwestern. Panasonic is near
> Eleven Mile.
> The AES pre-meeting dinner will be held at Shield's Pizzeria, 25101
> Telegraph Rd., Southfield, Michigan, (248) 356-2720.
>
> David Carlstrom
>
> SMWTMS:  http://users.htdconnect.com/~djcarlst/smwtms.htm
>
> in case of difficulty you may want to send mail to David6040@...

David Carlstrom wrote:

> From: "MARK T OPPAT" <moppat@...>
> To: <djcarlst@...>
> Subject: Fw: MARC SWAP FEB 2, 2002
> Date: Wed, 2 Jan 2002 12:58:27 -0500
> Organization: Prodigy Internet
> X-MSMail-Priority: Normal
> X-Mailer: Microsoft Outlook Express 5.00.2615.200
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>
> Subject: MARC SWAP FEB 2, 2002
>
> >     Hi Dave,
> >
> > Could you please send an email note to the SMWTMS crowd, that the next
> > Michigan Antique Radio Swap is coming soon?
> >
> > Date is :  Saturday,  Feb 2, 2002.
> >  9am-3pm.  at Armenian Community Center, 19319 Ford Rd, Dearborn,  east of
> > Evergreen, on north side.
> >
> > Approx.  90 tables of stuff for sale!  some tables still left at $10 ea.
> > Admission is only $5.   We have a donation auction, too, with cheap stuff
> at
> > the end of the swap.
> >
> > Hope to see everyone there, and dont forget our spring swap is in Midland,
> > April 27, 2002 and our HUGE "Extravaganza" in Lansing is July 11-14.  Flea
> > market is Fri July 12 and Sat July 13.  Donation auction is Sun, July 14.
> >
> > Thanks,  Mark Oppat  MARC Publicity Dir.

Robert Zurek wrote:

> PLEASE POST THIS NOTICE IN YOUR OFFICE
>
>            Audio Engineering Society
>                     Chicago Section
>
> Tuesday, January 15th 2001, 7:30 PM
>
> Understanding 1-bit Sigma-Delta Modulators:  Is 1 bit sufficient for
> audio?
> By: John Vanderkooy, Audio Research Group,
> University of Waterloo
>
> The next meeting of the AES Chicago Section will be held on Tuesday,
> January 15 at the Holiday Inn North Shore in Skokie. John Vanderkooy of
> the University of Waterloo will discuss 1-bit sigma-delta modualtors.
> The recent introduction of the Super-Audio CD as a new high-resolution
> consumer format has prompted this study of 1-bit systems.  Although
> 1-bit modulators are a viable solution for a great many purposes from cell
> phones to sound cards and much more, they have definite limitations and
exhibit
> a number of curious properties.  Our study of these devices has been
> largely through computer simulation, and we have developed a form of coherent
> averaging which clearly shows some of the underlying nonlinear mechanisms
> in the 1-bit modulator.  Such modulators are capable of good audio, but
> they are wasteful of storage requirements and do not have the perfectable
> characteristics of wider bit width linear PCM.
>
> Dinner will begin at 6:30pm with the presentation immediately following
> dinner at about 7:30pm. For menu information or to make dinner
> reservations, call Treasurer Simone Koo at (815) 884-2133 by noon on
> January 15th. You can also reach Simone by calling his pager at (888)
> 597-8606 or 5978606@.... All AES members will receive a $1.00
> discount on dinner. All student members (with student ID) will receive a
> $10.00 discount.
>
> Meeting Location:
> Holiday Inn North Shore in Skokie
> 5300 West Touhy Avenue Skokie, IL
> (at the northeast corner of Touhy and Niles Center Road)
>
> About this Month’s Speaker
> John Vanderkooy:
>
> Upcoming Meetings
>
> January 15, 2002 – John Vanderkooy – Understanding 1-bit Sigma-Delta
> Modulators:  Is 1 bit sufficient for audio?
>
> February 12th, 2002 – Doug Button of JBL Professional
>
> March 12th, 2002 – Bob Adams of Hoover & Keith Inc. – Acoustical
> Implementation in the Real World
>
> April 10th, 2002 – Gerald Stanley
>
> May 14th, 2002 – Larry Crosby of Symphonix
>
> AES Chicago Section
> January Meeting Summary
>
> What: Understanding 1-bit Sigma-Delta Modulators:  Is 1 bit sufficient
> for audio?
> Who: By John Vanderkooy of Audio Research Group, University of Waterloo.
>
> When: Tuesday, January 15th, 7:30 PM
> Where: Holiday Inn North Shore, Skokie

Robert Zurek wrote:

> PLEASE POST THIS NOTICE IN YOUR OFFICE
>
>            Audio Engineering Society
>                     Chicago Section
>
> Tuesday, January 15th 2001, 7:30 PM
>
> Understanding 1-bit Sigma-Delta Modulators:  Is 1 bit sufficient for
> audio?
> By: John Vanderkooy, Audio Research Group,
> University of Waterloo
>
> The next meeting of the AES Chicago Section will be held on Tuesday,
> January 15 at the Holiday Inn North Shore in Skokie. John Vanderkooy of
> the University of Waterloo will discuss 1-bit sigma-delta modualtors.
> The recent introduction of the Super-Audio CD as a new high-resolution
> consumer format has prompted this study of 1-bit systems.  Although
> 1-bit modulators are a viable solution for a great many purposes from cell
> phones to sound cards and much more, they have definite limitations and
exhibit
> a number of curious properties.  Our study of these devices has been
> largely through computer simulation, and we have developed a form of coherent
> averaging which clearly shows some of the underlying nonlinear mechanisms
> in the 1-bit modulator.  Such modulators are capable of good audio, but
> they are wasteful of storage requirements and do not have the perfectable
> characteristics of wider bit width linear PCM.
>
> Dinner will begin at 6:30pm with the presentation immediately following
> dinner at about 7:30pm. For menu information or to make dinner
> reservations, call Treasurer Simone Koo at (815) 884-2133 by noon on
> January 15th. You can also reach Simone by calling his pager at (888)
> 597-8606 or 5978606@.... All AES members will receive a $1.00
> discount on dinner. All student members (with student ID) will receive a
> $10.00 discount.
>
> Meeting Location:
> Holiday Inn North Shore in Skokie
> 5300 West Touhy Avenue Skokie, IL
> (at the northeast corner of Touhy and Niles Center Road)
>
> About this Month’s Speaker
> John Vanderkooy:
>
> Upcoming Meetings
>
> January 15, 2002 – John Vanderkooy – Understanding 1-bit Sigma-Delta
> Modulators:  Is 1 bit sufficient for audio?
>
> February 12th, 2002 – Doug Button of JBL Professional
>
> March 12th, 2002 – Bob Adams of Hoover & Keith Inc. – Acoustical
> Implementation in the Real World
>
> April 10th, 2002 – Gerald Stanley
>
> May 14th, 2002 – Larry Crosby of Symphonix
>
> AES Chicago Section
> January Meeting Summary
>
> What: Understanding 1-bit Sigma-Delta Modulators:  Is 1 bit sufficient
> for audio?
> Who: By John Vanderkooy of Audio Research Group, University of Waterloo.
>
> When: Tuesday, January 15th, 7:30 PM
> Where: Holiday Inn North Shore, Skokie

David Carlstrom wrote:

> 161 ST  SMWTMS MEETING DETAILS
>
> DATE:  Saturday  January 19, 2002
>
> TIME:  2 PM Until ?
>
> FORMAL MEETING:  4 PM
>
> COHOST: Tom Gilmore
>
> HOST: Tony Henrichs
> 1269 Whittier
> Grosse Pointe Park MI 48230
> 313-882-3661
>
> LECTURE: "The Anatomy of Two Woofers" or "The Tale of Two Twelves".  David
> Clark will report on the 12" stroke-king, the JL Audio 12W7 and the 12"
> Sonic Saucer which is less than 2.5 inches deep below the mounting surface.
> The JL is deeper than it is wide. DUMAX measurements, recommended enclosures
> and applications will be covered.
>
> CES REPORT: Tom Nousaine and David Clark will report. David promises to
> answer Joe Prahler's questions on the differences and advantages of the
> "new" CD formats, CD, SACD, DVD-audio and what may be coming next.
>
> HOST ASSIGNMENTS:  Please check your host and co-host assignments below.
> Note that assignments are made to give hosts and cohosts fair warning.  In
> spite of the appearance of rigidity, the schedule is flexible.  Volunteered
> changes are welcome.  If you have a suggestion, do not hesitate to offer it.
> Contact David Carlstrom with your ideas.
>
> CALENDAR:  DATE / PROGRAM / HOST   / CO-HOST:
>
>     3/9/2002 / ???   / ???   / Fred Bruflodt
>   5/11/2002 / ???   / Ray Kilmanas  / Gerald Verbaan
>   7/13/2002 / Trunk Sale  / Steve Maki  / Art Greenia
>   9/21/2002 / Autosound  / DLC Design  / Cliff Merz
>   11/9/2002 / ???   / David Carlstrom / Richard Green
>
> David Carlstrom
> SMWTMS:  http://users.htdconnect.com/~djcarlst/smwtms.htm
> AES:  http://users.htdconnect.com/~djcarlst/aes.htm
> in case of difficulty you may want to send mail to David6040@...

Alvin Foster wrote:

> BOSTON  AUDIO  SOCIETY
>
> January 2002, Meeting
>
> Date:  Sunday, January 20
> Time: 6:00 PM
>
> Place: Room 120
>  National Transportation Systems Center
>  55 Broadway, Cambridge, MA
>
> Featured Guests: All BAS Members in Attendance at CES
>
> Meeting Topic: CES Reports
>
> The January meeting of the BAS will feature the annual "CES Report" by BAS
members in attendance at the 2002 Consumer Electronics Show in Las Vegas. Local
BAS attendees at the show were Phyllis Eliasberg, Alvin Foster, Brad Meyer, and
Stephen Owades. They will report on what they saw and the best sound at the
show. There will be plenty to discuss, lots of pictures, brochures and samples
to pass around. The CES Report is one of our most popular meetings of the year.
>
> CES continues to tilt or emphasize more of the video scene; however, the push
to buy more computers has declined. The drive for more speakers, amplifiers,
etc., to obtain even more channels and outputs continues in fast-forward. In
spite of the trend, this year's show had a lot of new and interesting audio
stuff unrelated to just more channels.
>
> · some very good (and some very bad) loudspeakers, including some whose
reasonable prices and sizes make them appealing for real-life home use;
> · digital room-correction and speaker-correction systems
>
> Other things of interest outside of audio included high-definition television
in multiple formats: direct-view, flat-panel, rear-projection, and
front-projection formats. The DLP is even more sophisticated this year and the
choice of the best picture & model has narrowed to three brands. Samsung was
showing off a 16-9 format computer monitor that doubles as a high resolution
HDTV. Join us to uncover the items you may want to include in your December Xmas
packages.
>
> DIRECTIONS
> By car:   Coming from Boston take the Longfellow Bridge over the Charles
River. Turn right, off Broadway at the first light, onto Third Street and then
take the first left  (Potter Street if the sign is posted). Go down a couple of
hundred yards and park near the loading dock area on the left. Walk down the
path to the left of the loading area into the courtyard; enter the door on your
right, and sign in at the guard station inside.
>
> By MBTA: Take the Red Line to Kendall Station and walk through the Cambridge
Marriott Hotel to Broadway. Cross the street and walk just to the right of the
building into the courtyard; the door with the guard station will be on your
left.
>
> BAS Future Meetings
>
> February - Robert Adams, Analog Devices
> March - Ensemble Stereo/Video Retail Store, Walter Swanbon
> April 21 - Dick Burwen's Hi-Fi visit to his home
> May -- Victor Campos, Audio Past & Future
>
> AES Future Meetings
>
> February 12 - Line Array Loudspeakers
> March 12 - Small Room Acoustics
>
> http://www.bostonaes.org/
>
________________________________________________________________________________\
________________
> President's Message
>
> 1.  The latest BAS Speaker (Vol. 24 No. 1) has been mailed.  It features 4
(count 'em 4) meeting summaries:  Scott Billington of Rounder Records, Bruce Van
Allen of Boulder Amplifiers, the 2001 CES and ALMA (Loudspeaker) conventions and
John Emerson's extensive presentation (9 pages) on antennas for digital
television reception.  Articles about resurrecting the AR3A, comparative tests
of phono stages and a user's report on ReplayTV combine with the usual news to
fill out the 36 pages.
>
> 2.  A recent problem with BAS e-mail meeting notices shows the value of
redundancy.  The first December meeting notice was mailed by Alvin Foster
Wednesday before the meeting on Sunday, then he left town.  When he returned
late Sunday he learned that the notices had been blocked by his ISP as spam.  I
had mailed the #2 notice routinely on Friday, so most people were informed about
the meeting.
>
> 3.  40,000 original negatives of the Kennedy family, stored in a vault in the
basement of the World Trade Center, have been deemed a complete loss (newscast).
>
> 4.  Steve Metcalf writes about the evolution of recorded sound:  in the early
days of the 20th century the Edison Recording Co. devised the slogan:
"Comparison with the Living Artist Reveals No Difference!"  That was the goal,
to faithfully replicate the experience of a live performance. Now as a listener
he finds the goal steadily fuzzier.  The new SACD and DVD Audio allow
multichannel reproduction, which makes stereo sound pale and flat, and "as
listeners become accustomed to these stunning multichannel sound-worlds, [won't]
a string quartet or even a whole orchestra heard from 30 rows back in the hall
also sound a little pale and flat?"  In pop music things started to get a little
confused with the album "Revolver" by the Beetles, where they were less
interested in whether they could perform their music live and instead of
> offered the LP as their ultimate musical product.  Nowadays in live
performance, prerecorded tracks are a commonplace part of making the sonic
product like the CD. [That's basically why I have little interest in
multichannel sound][Union Leader 10De01].
> http://bostonaudiosociety.org
>
> The Boston Audio Society
> POB 211
> Boston, MA  02126
> Tel: (603) 899-5121

Hello all,

Just wanted to announce that Praxis can now be downloaded from the Liberty
Instruments web site (www.libinst.com).

The "AudPod" device will not be available for a few months, but the software can
still do some nice things even without it (and its free to use it that way,
too).  A manual (pdf format) can also be downloaded.

Enjoy,

Bill Waslo

(please don't reply to this email address bwaslo@..., it gets so much spam I
can't find real messages in it -- I can be reached for the time being at
"libinst at yahoo.com").



[Non-text portions of this message have been removed]

In a message dated 1/18/02 6:19:32 PM Mountain Standard Time, bwaslo@...
writes:

<< Just wanted to announce that Praxis can now be downloaded from the Liberty
Instruments web site (www.libinst.com).  >>

Has anybody been able to download Praxis yet?
I have tried 6 times and have not been able to get beyond 3.5Mb.
KenL

On 20 Jan 2002, at 7:46, klehma@... said:

> Has anybody been able to download Praxis yet?
> I have tried 6 times and have not been able to get beyond 3.5Mb.

I downloaded both the program and manual yesterday morning around 5:30
with no trouble at all. Took about 17 min on my slow dial-up connection.

In a message dated 1/20/02 6:05:36 AM Mountain Standard Time,
etunstal@... writes:

<<
  I downloaded both the program and manual yesterday morning around 5:30
  with no trouble at all. Took about 17 min on my slow dial-up connection. >>

Intresting....
I have tried all different times, the latest was 5:00am this morning. A
friend of mine is having the same results as I.
Yet I was able to download Office 97 Service packs 1 & 2 from microsoft, 8mb
and 25mb respectively, yesterday without a hitch.
KenL

In a message dated 1/20/2002 7:43:21 AM Central Standard Time, klehma@...
writes:


> <<
> I downloaded both the program and manual yesterday morning around 5:30
> with no trouble at all. Took about 17 min on my slow dial-up connection. >>
>
> Intresting....
> I have tried all different times, the latest was 5:00am this morning. A
> friend of mine is having the same results as I.
> Yet I was able to download Office 97 Service packs 1 & 2 from microsoft,
> 8mb
> and 25mb respectively, yesterday without a hitch.
> KenL
>

So far, I've tried 8 times to DL Praxis.  5 times through my dial up and
standalone IE6, and 3 through AIOL's explorer.   The most I've mannaged to
get downloaded is 3.7MB.  I too have tried various times.  As early as 8:00
am, and late as 2:30 A.M.

Deon


[Non-text portions of this message have been removed]