"Dave Plowman (News)" wrote in message
...
Progress.

Ran a ground inside the amp from the star ground point to the screen pin
on the XLR7. Buzz now constant - and makes no difference if you get close
or touch anything.

X/0 was bolted to the speaker stand. Stand made of ally Speedframe, and
the joints (corners etc) are plastic covered so may well not make a good
electrical connection. Amp is just sitting on crossbars and has rubber
feet, so insulated.

Unbolting the X/O and just leaving it lying on top of the amp, clean.

Insulating the mounting between X/O and stand is going to need thought,
though. At the moment it's just a basic rack mount.

Wonder why walking up close to it makes the buzz go away. Presumably
that is entirely mechanical, for some reason your ears don’t hear the
buzz when they are in that location relative to the speakers.