What I don't get is why does grounding only one lead remove nearly all whining, yet grounding both leads induces it? I tried grounding these wires directly to the amp earth with exactly the same effect.

It could be that connecting the TWO ground leads re-sets the ground loop between the F/B & alternator, only one connection provides the 'reference grounding' of the amps and empeg to 0V.


BTW good to hear another Australian customer. next time you're on the east drop me a line



-- Murray
Empeg changed my life and it did happen overnight.