hi,

have you tried the mensa di/o in another system to see if it hums
there, as well? also, in the trends system, have you tried using
"cheater" plugs on any of your three-pronged power cords? sometimes
lifting a ground on a component will eliminate a ground-loop hum,
which it seems you have got, w/the mensa di/o.

doug s.
--- In DIOmods@yahoogroups.com, "jtaytay2000" <jtaytay2000@...> wrote:
>
> I've got two ART Dios, one unmodded and the other full mensa mods by
> Boulder Cables. I've been setting up a biamped setup in two systems.
> The setup with the unmodded one works fine. The setup with the modded
> one has a loud hum.I've eliminated other things and swapped the DACs
> and the hum disappears when the unmodded one is inserted.
>
> Any ideas why this happens with the modded one and how I can get rid
> of the hum with the biamped setup? I'd really like to hear the sound
> quality with the modded DAC when biamped.
>
> The way I've biamped is a bit unusual. I'm using a couple of trends
> audio TA10 amps, no pre-amp. I use phono adapters to split/double the
> analogue out from the DACs. The two 'rights out' go to the left and
> right inputs on one TA10, then I biwire that amp to my right speaker.
> Likewise the left signal out (as split). So the right and left
> channel of one amp is providing separate power to the higher or lower
> frequencies of one speaker.
>
> I'm hoping there's an easy work around to the hum problem. I also
> wonder if its at all connnected to the problem where the DAC drops
> the signal sometimes when changing CD - (this only happens with my
> modded DAC). I can turn the CD transport off and on, and hear a pop
> when the modded DAC has regained the signal. Is it the hum earth
> related?
>
> Any help would be appreciated.
>
> thanks
>
> Chris
>