In article , Glenn Richards wrote:
[...]
I then switched the power cable on the amplifier to use the Isotek
cable. Immediately there was an improvement in dynamics, percussion in
particular had much more presence and depth.

I switched back to the standard IEC cable and listened again to ensure
that there was in fact a difference and that I wasn't imagining things.
The sound seemed flat after switching back.

Next I tried the standard cable with filtered plug. This again made
quite a dramatic difference to dynamics. Perhaps not quite so much as
the Isotek cable, but that may be the psychological bit coming into
play. But maybe not, as later tests showed.
[...]

Did you measure anything objectively with instruments? Anything at all?
Doesn't it ever cross your mind how remarkable it is that after the mains
current has travelled all those miles underground and overhead, the last
few feet can make such a difference? Are you sure you're really hearing
what you think you're hearing?

Rod.