On Wed, 19 Oct 2005 00:53:38 GMT, Luke Siemaszko
wrote:

wrote:

Hi,

How important is the quality of power cords in a high end system?
Does it really make a difference in sound?

Thanks,

Vasilis


Slightly off topic:

A pro amplifier designer of my acquaintance told me that he hated IEC
power inlets for amplifiers because he had measured up to 7V drop across
them in test.

Anyone else agree / disagree ?

If that ever really happened, the socket would overheat and burn out.
He may be referring to the combination of plug, socket and fuse -
which would make him pretty incompetent.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

Luke Siemaszko wrote:

A pro amplifier designer of my acquaintance told me that he hated IEC
power inlets for amplifiers because he had measured up to 7V drop across
them in test.

Anyone else agree / disagree ?

I disagree. Let's take a 2kW pro amp as an example. That will be drawing
peaks of close to 13A when run at full power. With a voltage drop of 7V
it will therefore be dissipating 91W. This would make such a small
volume heat up so much that you would get severe burns trying to unplug it.

Of course, you could put hundreds of amps through it to get it to drop
the claimed 7V, but that's not a realistic test for mains use.

--
Mark.
http://tranchant.plus.com/

In article ,
Mark Tranchant wrote:
I disagree. Let's take a 2kW pro amp as an example. That will be drawing
peaks of close to 13A when run at full power.

Then an IEC connector isn't really suitable. The maximum they can handle
is 10 amps - some 6. Something like the mains version of the Speakon would
be more like it.

But most of the large PA rigs I've seen use those industrial 16 amp types.

--
*I can see your point, but I still think you're full of ****.

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

In article , Luke Siemaszko
wrote:


A pro amplifier designer of my acquaintance told me that he hated IEC
power inlets for amplifiers because he had measured up to 7V drop across
them in test.

Anyone else agree / disagree ?

The only time I have ever come across anything like that was when the
socket contained either a fuse or a filter, and the current was high.
Otherwise I would take it as a sign of a (dangerous) fault in the socket.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

"Luke Siemaszko" wrote in
message


A pro amplifier designer of my acquaintance told me that
he hated IEC power inlets for amplifiers because he had
measured up to 7V drop across them in test.

Anyone else agree / disagree ?

I'm sure its happened with some combination of
inadequate/broken equipment and exceptional stress.

I've seen wall outlets cause signficant voltage drops, as
well.

The logical error is pretty obvious - few if any of us have
stopped riding in cars because one had an accident one day
not too long ago.

Another factor to consider - power amp designers tend to
spend a lot of time watching power amps perform an unnatural
act - deliver full power for an extended period of time. In
actual use, playing music that is unclipped, power amps on
the average draw only a fraction of their full power.

Most demands for full power while playing music are so short
that they have relatively small effects on the power that is
drawn from the power line. I

OW just because a power amp delivers max power for a loud
passage does not mean that maximum power was drawn from the
power line. Most of those transient needs are satisfied by
the power supply capacitors, not the power plug.

wrote in message
ups.com...
Hi,

How important is the quality of power cords in a high end system?

**Not at all.

Does it really make a difference in sound?

**Nope. I prove this regularly to people who are deluded into thinking that
it makes a difference. Follow my logic:

I use an amplifier which has no speaker relay protection systems. Therefore,
when it is unplugged, it can still deliver power to the speakers, for as
long as the main capacitor banks can supply it. The main filter caps total
250,000uF. This means the amplifier can deliver a handful of Watts for
several seconds. Plugging and unplugging the amp from the 240VAC mains
supply is inaudible to all listeners. Therefore, there can never be any
difference between power cords.


--
Trevor Wilson
www.rageaudio.com.au

Trevor Wilson wrote:
wrote in message
ups.com...

Hi,

How important is the quality of power cords in a high end system?


**Not at all.


Does it really make a difference in sound?


**Nope. I prove this regularly to people who are deluded into thinking that
it makes a difference. Follow my logic:

I use an amplifier which has no speaker relay protection systems. Therefore,
when it is unplugged, it can still deliver power to the speakers, for as
long as the main capacitor banks can supply it. The main filter caps total
250,000uF. This means the amplifier can deliver a handful of Watts for
several seconds. Plugging and unplugging the amp from the 240VAC mains
supply is inaudible to all listeners. Therefore, there can never be any
difference between power cords.



Ahh, thats because your capacitors are already filled from the corrupted
supply :-)

--
Nick

"Nick Gorham" wrote in message
...
Trevor Wilson wrote:
wrote in message
ups.com...

Hi,

How important is the quality of power cords in a high end system?


**Not at all.


Does it really make a difference in sound?


**Nope. I prove this regularly to people who are deluded into thinking
that it makes a difference. Follow my logic:

I use an amplifier which has no speaker relay protection systems.
Therefore, when it is unplugged, it can still deliver power to the
speakers, for as long as the main capacitor banks can supply it. The main
filter caps total 250,000uF. This means the amplifier can deliver a
handful of Watts for several seconds. Plugging and unplugging the amp
from the 240VAC mains supply is inaudible to all listeners. Therefore,
there can never be any difference between power cords.



Ahh, thats because your capacitors are already filled from the corrupted
supply :-)

--
Nick
Corrupted mains supply does not equal corrupted audio delivery - as long as
the reservoir cap/s has/ve more reserve energy joules than demanded by
programme material dissipating into load.

Jim Gregory wrote:
"Nick Gorham" wrote in message
...

Trevor Wilson wrote:

wrote in message
groups.com...


Hi,

How important is the quality of power cords in a high end system?


**Not at all.



Does it really make a difference in sound?


**Nope. I prove this regularly to people who are deluded into thinking
that it makes a difference. Follow my logic:

I use an amplifier which has no speaker relay protection systems.
Therefore, when it is unplugged, it can still deliver power to the
speakers, for as long as the main capacitor banks can supply it. The main
filter caps total 250,000uF. This means the amplifier can deliver a
handful of Watts for several seconds. Plugging and unplugging the amp
from the 240VAC mains supply is inaudible to all listeners. Therefore,
there can never be any difference between power cords.



Ahh, thats because your capacitors are already filled from the corrupted
supply :-)

--
Nick

Corrupted mains supply does not equal corrupted audio delivery - as long as
the reservoir cap/s has/ve more reserve energy joules than demanded by
programme material dissipating into load.



I take it you didn't see the smilie then?

--
Nick

"Nick Gorham" wrote in message
...
Jim Gregory wrote:
"Nick Gorham" wrote in message
...

Trevor Wilson wrote:

wrote in message
egroups.com...


Hi,

How important is the quality of power cords in a high end system?


**Not at all.



Does it really make a difference in sound?


**Nope. I prove this regularly to people who are deluded into thinking
that it makes a difference. Follow my logic:

I use an amplifier which has no speaker relay protection systems.
Therefore, when it is unplugged, it can still deliver power to the
speakers, for as long as the main capacitor banks can supply it. The
main filter caps total 250,000uF. This means the amplifier can deliver a
handful of Watts for several seconds. Plugging and unplugging the amp
from the 240VAC mains supply is inaudible to all listeners. Therefore,
there can never be any difference between power cords.



Ahh, thats because your capacitors are already filled from the corrupted
supply :-)

--
Nick

Corrupted mains supply does not equal corrupted audio delivery - as long
as the reservoir cap/s has/ve more reserve energy joules than demanded by
programme material dissipating into load.

I take it you didn't see the smilie then?

--
Nick
Oops, sorry, now I have :-|