I've just run a cable from the left interconnect to the earth pin on the
plug for the speakers power supply.  I've also put a resistor in the
middle of the cable.  There's probably lots of reasons why this is a
very stupid thing to do (which is why it's currently unplugged!), but
it cured the hum nicely.  I suppose my problems come when the cable
becomes detached from the earth pin and wanders over to live or
neutral...

Max

Roy Owen Wrote: 
> On 11/16/05, Alex Twisleton-Wykeham-Fiennes <alex (AT) fiennes (DOT)
> org> wrote:
> >
> > On Wednesday 16 November 2005 12:57, max.spicer wrote:
> > > Alex Twisleton-Wykeham-Fiennes Wrote:
> > > > does this occur only when both speakers are connected to the
> squeeze
> > > > box?
> > >
> > > I'm not sure. I'll experiment tonight.
> > >
> > > > Also, how are the speakers powered? Is there a separate supply
> for
> > each
> > > >
> > > > speaker or are they daisy-chained together in some way?
> > >
> > > The left speaker is daisy-chained from the right speaker. The
> right
> > > speaker has a input from a separate power supply.
> >
> > Is the speaker power supply earthed?
> >
> > Alex
> 
> 
> Good point. You might try using a 3 prong adapter or ground lift. I've
> seen
> this problem many times at live music events. Usulally it happens when
> the
> mixer is at a differnt ground ponential than the instruments. Using a
> ground
> lift almost always solves thsi problem.


-- 
max.spicer

The wild things roared their terrible roars and gnashed their terrible
teeth
and rolled their terrible eyes and showed their terrible claws
but Max stepped into his private boat and waved good-bye
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