Thanks for the reply Doug. The mensa modded DI/O works fine in other
systems where integrated amps are used. No hum/noise. I tried it in
two different setups with the Trends Audio TA10's biamped (ie just
the cd transport and speakers changed. In both cases, there was the
same loud hum.

I'm interested in the 'cheater' plug suggestion. I'm based in the Uk
and have never heard of a cheater plug? I'm also don't know what
constitutes 'lifting a ground'. Can I make my own 'cheater' plug or
anyone know if they can be bought in the UK? Also, any other easy
ways to 'lift a ground' worth trying.

Chris

--- In DIOmods@yahoogroups.com, "sedond" <dsedon@...> wrote:
>
> 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
> >
>