"Dave Plowman (News)" wrote in
message
In article ,
Don Pearce wrote:
Turn your amplifier on, with no music playing and
listen. Leave the volume control in the normal listening
position and sit in your listening chair. What can you
hear? Anything? Of course not. And what little hiss
there is comes from the front end of the amplifier. None
of it comes from the mains.

You've never heard things like a fridge splat etc which
is mains borne? Of course it depends on the design of the
power supply in your amp, etc.

Most such interference probably does not come in via the power supply or
component power cord.

I've got a dedicated radial circuit with its own earth
feeding my AV equipment.

It's probably the clean ground that's providing any noticable benefit. It's
pretty hard to make up a clean ground with a line cord filter.