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.

--
*I used up all my sick days so I called in dead

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

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.

"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.

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

--
*I used up all my sick days so I called in dead

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



If folk happen to have mains borne fridge splats etc. surely employ RC
snubbers at the source (or if it really bad replace those burnt arcing
contacts) rather than going to the expense of filtering the mains for the AV
equipment. I borrowed some hi-fi branded mains filters - read expensive -
before I had a dedicated circuit and in every case they either made no
audible difference or they 'appeared' to be deleterious to the sound
(sighted evaluations of course).

Mike

In article , Dave Plowman (News) 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.

I've got all my electrical equipment plugged into the normal wiring that came
with the house, no fancy filters anywhere, nothing special at all, and have
never heard any splats from my loudspeakers since I stopped listening to AM
radio. There's no audible hiss from a normal listening position either, even
if I turn the volume control to its upper endstop. (Normal listening requires
about a quarter turn). My audio and video equipment is not the sort of silly
pretentious stuff that costs a king's ransom, and it's not cheap rubbish
either, just carefully chosen well-designed gear that works.

Rod.

Roderick Stewart wrote:

I've got all my electrical equipment plugged into the normal wiring
that came with the house, no fancy filters anywhere, nothing special
at all, and have never heard any splats from my loudspeakers since I
stopped listening to AM radio. There's no audible hiss from a normal
listening position either, even if I turn the volume control to its
upper endstop. (Normal listening requires about a quarter turn). My
audio and video equipment is not the sort of silly pretentious stuff
that costs a king's ransom, and it's not cheap rubbish either, just
carefully chosen well-designed gear that works.

Go on then, what kit have you got?

--
Glenn Richards Tel: (01453) 845735
Squirrel Solutions http://www.squirrelsolutions.co.uk/

IT consultancy, hardware and software support, broadband installation

In article , Glenn Richards wrote:
I've got all my electrical equipment plugged into the normal wiring
that came with the house, no fancy filters anywhere, nothing special
at all, and have never heard any splats from my loudspeakers since I
stopped listening to AM radio. There's no audible hiss from a normal
listening position either, even if I turn the volume control to its
upper endstop. (Normal listening requires about a quarter turn). My
audio and video equipment is not the sort of silly pretentious stuff
that costs a king's ransom, and it's not cheap rubbish either, just
carefully chosen well-designed gear that works.

Go on then, what kit have you got?

The heart of the audio kit is a Cambridge Audio 540A amplifier, a 640C CD
player and a 640T tuner. Loudspeakers are Bowers and Wilkins DM2s bought
some time in the early 1970s and still sounding so good I've never felt
inclined to replace them. I have Sennheiser HD 560 headphones too.
There's also a NAD tape deck, a Hitachi VHS machine, a Matsui freeview
box, two Panasonic HDD/DVD recorders and a Humax HDD recorder. My laptop
computer normally sits on a nearby shelf so I can feed its audio output
into the system and listen to internet radio, though now that the novelty
has worn off I rarely do. Some of this gear isn't used much so it will
probably eventually go the same way as the Garrard 401 turntable and SME
pickup arm I got rid of about 20 years ago.

The sound is beefy enough for the loudest listening I like to do, and
sweet and clear at low volume for late light listening (or viewing) and
there are no spurious hisses hums or splats under any circumstances.

Rod.