On Thu, 16 Mar 2006 11:14:28 +0000 (GMT), "Dave Plowman (News)"
wrote:

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.

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

No - never heard a thing come through the mains. If I started hearing
stuff now, I wouldn't be buying mains filters - I'd be fixing the
wiring.

d

Pearce Consulting
http://www.pearce.uk.com

In article ,
Don Pearce wrote:
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.

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

No - never heard a thing come through the mains. If I started hearing
stuff now, I wouldn't be buying mains filters - I'd be fixing the
wiring.

Hmm. Switch off an inductive load like a motor on the same ring as an amp
and you'll hear it - or at least be able to measure the spike.

--
*A fool and his money are soon partying *

Dave Plowman London SW
To e-mail, change noise into sound.

On Thu, 16 Mar 2006 14:17:15 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Don Pearce wrote:
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.

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

No - never heard a thing come through the mains. If I started hearing
stuff now, I wouldn't be buying mains filters - I'd be fixing the
wiring.

Hmm. Switch off an inductive load like a motor on the same ring as an amp
and you'll hear it - or at least be able to measure the spike.

On the mains, certainly - not at the speaker terminals.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

"Stewart Pinkerton" wrote in message
news
On Thu, 16 Mar 2006 14:17:15 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Don Pearce wrote:
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.

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

No - never heard a thing come through the mains. If I started hearing
stuff now, I wouldn't be buying mains filters - I'd be fixing the
wiring.

Hmm. Switch off an inductive load like a motor on the same ring as an amp
and you'll hear it - or at least be able to measure the spike.

On the mains, certainly - not at the speaker terminals.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

You could well get a sharp crack coming through the 'speakers. It would
depend on the amplifier's design, whether it had a filter on its mains input
and whether the amplifier design had sufficient power supply rejection.

S.

In article ,
Stewart Pinkerton wrote:
Hmm. Switch off an inductive load like a motor on the same ring as an
amp and you'll hear it - or at least be able to measure the spike.

On the mains, certainly - not at the speaker terminals.

Depends on the power supply in the amp.

--
*A person who smiles in the face of adversity probably has a scapegoat *

Dave Plowman London SW
To e-mail, change noise into sound.