I can take the amp out and sit it on the seat, which is about half a metre (1 1/2 feet for you Americans) away from the empeg, and that doesn't appear to make any difference.

I tryed moving the microphone and serial cables around behind the sled and *thought* it made a small difference when I kept them as far as possible away from the audio cables.

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)