Laurence Payne wrote:

He's suggesting that a filtered power lead can reduce interference
from an adjacent computer. Not that it's improving the mains supply
as such.

The other thing we noticed, that when I re-read my post I seem to have
omitted (I'm sure I remember typing this bit, obviously not though)...

Whilst doing the second part of the test round at a friend's house, we
also tried putting the filtered cables onto his PC instead of the hi-fi.
The results from this were the same as when the PC was turned off.

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