I think it's fair to say that power cables do make a difference to the sound, but for me it's minimal. Naim also say that their own one is the one to use.

I think it might have more to do with the impedence of the cable more than the proposed RFI shenanigans.

Michael, just one last word about the seismic sink. You wrote:

"...it was clearly demonstrated to me how the sink kills any vibration in the component sitting on it stone dead."

I can't see how that could ever be demonstrated.

"...common sense would imply that the method chosen to do it (pneumatic suspension) would be very effective. However, I've yet to have it demonstrated to me that killing the vibration makes any difference to the sound. At the one with/without demo of the sink I've heard, the result was far from clear cut for me."

I agree with you that the sink doesn't appear to improve sound quality at all. I would have thought that use of an air column within the sink would be an undesirable thing.