On Mon, 20 Mar 2006 22:22:45 +0000, 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".

Which would make perfect sense, as by taking out RF interference what
you've done is lowered the noise floor. You may not be able to hear RF,
but if your amplifier is trying to reproduce it then it's increased the
noise floor, which will result in the dynamic range of the system being
reduced.

Which is why you shouldn't design an amplifier with a ridiculously
extended frequency range.