What happens if you disconnect the shield from DI to mixer

If this reduces the noise, you should get a soldering iron and change
the signal earth with chassis earth from mixer.

If it does not reduce noise its not a groundloop problem.

Hope it helps.

--- In Doepfer_a100@yahoogroups.com , "stuadh" <stuadh@...> wrote:
>
> Hi all,
>
> thanks for your answers. I got the DI Box, one recommended on the
> SOS Website (ART Cleanbox II) and not the cheapest one around. Not
> one bit of difference. I connected up the earths of all the cables
> again (and again no difference. This is definitely a
> Mixer-Analogue Synth problem as removing any connection between the to
> makes the problem disappear. By the way, this isn't a small problem -
> it's really loud!
>
> Can anyone offer the next step as the synth is currently unusable
>
> Your in desperation
>
> Stuadh
>
> --- In Doepfer_a100@yahoogroups.com , "Carlos" <bushwick@> wrote:
> >
> >
> > if you are in the US try one of those cheap plug adapters from 3 ends
> > to two on your computer's power cable plug, (so the 3rd circular ends
> > up removed from the equation) this solved a problem I had before with
> > my laptop causing ground noise. but might be more of a temporary
> > solution. I just don't use the laptop anymore :)
> >
> >
> > Carlos.
> >
> > --- In Doepfer_a100@yahoogroups.com , "Anwander, Florian"
> > <Florian.Anwander@> wrote:
> > >
> > > Hi
> > >
> > > we had similar problems last week within a large live setup.
> Around 15
> > > musicians with computers, lots of synths and softsynth, all
mixed to
> > > submixers, which are led to a main mix. The lenght of the power and
> > > audio cables are 6 meters for the most musicians at least.
> > >
> > > Though this sounds like a bunch of humm traps the most
> participians do
> > > not have real problems, but two guys:
> > > Finally we could track down that these two are using
> > USB-Audiointerfaces
> > > where the interfaces are powered by the USB port, not by an
external
> > > supply. This means that you have the dirty ground of the digital
> domain
> > > as audioground.
> > >
> > > Our solution now was simply to forbid this type of audiointerfaces.
> > >
> > > Florian
> > >
> > > stuadh wrote:
> > >
> > > > Hi,
> > > >
> > > > I would like to appeal to anyone with experience in
eradicating a
> > > > probable ground loop. I've just done a bit of upgrading in my
> studio,
> > > > and I've developed a nasty buzzing in my system. I've narrowed it
> > > > down to the interplay between Logic 7 and my analogue synth. Of
> note
> > > > is that I have not changed anything inside the synth since
> before the
> > > > upgrade and that the problem exists even when the synth is
> turned off
> > > > but not when it is unplugged from the wall. In fact, I've
just been
> > > > jiggling about with the plug and the buzz come back as soon as the
> > > > earth pin of the plug makes contact.
> > > >
> > > > The problem also only exists when Logic is running but not
when i
> > > > run things like iTunes etc. It can also be controlled by the
mixer;
> > > > turning down the channel volume or EQing it out work. I've also
> gone
> > > > around turning off and unplugging everything except the computer,
> > > > synth and mixer, but the buzz remains.
> > > >
> > > > Can anyone help
> > > >
> > > > Yours Aye
> > > >
> > > > Stuadh
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > >
> > > --
> > > Florian Anwander |ConSol
> > > Tel. +49(89)45841-133 |Consulting&Solutions Software
GmbH
> > > Fax +49(89)45841-111 |Franziskanerstr. 38, D-81669
> München
> > > email: florian.anwander@ | http://www.consol.de
> > >
> >
>