I have been listening all after noon, I think it is ground loop coming from the Empeg itself, I do get a bit of this in the car, but I have put filters on the RCA outs to stop this.

mmm, do you think I different PSU may help, I have noticed a slight hummimg when the dock is plugged in without the empeg in ??? This goes away when I push it into the dock and I can hear the HD's again, although I can hear my mouse moving around too ???

It is only very slight, I can only hear it the gaps etc...

I have made an mp3 of the noise, this is not amplified, it is with the song paused and change tracks, you can hear the first then second drive spin up and then data transfer, I have just taken the sled out of the car and rigged it up here to take the dock out of the equation, the only thing that solves it is to go to the DC Power in, then no noise ???

Any clues, oh mp3 is here ... http://www.2b1q.com/empeg/empegnoise.mp3

Cheers

Cris.