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Old 7th November 2003, 11:44 AM   #21
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by li_gangyi
yeah...not to mention the many hundreds maybe kilo meters of wire to your substation and then to ur home...do those have to be upgraded to audiophile quality power cables??
No, you need only consider the cableing that is subejct to various circulating noise current loops and/or aerial loops. Theses usually reach to the distribution extension or power conditioner/distribution or in the worst case the actual house/flat wiring up to to the distribution after the meter.

Also, in many cases well installed house wiring can be quite "audiophile" in nature. Often cables are placed in metal piping (for protection) and in-wall house wiring invariably uses solid core wiring, giving you shielded, solid core mains wiring around the house. Not a bad start if you ask me.

Sayonara
 
Old 7th November 2003, 11:55 AM   #22
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Hmmm...sure as hell beats the twin cables some of our older flats have here...
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Old 7th November 2003, 12:22 PM   #23
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If they can?

Can a change of air-intake improve the power of your enegine?

Off course, but still the grade of improvement depends on what enegine you run and on your driving-experience. Grandma might not notice any change..


- and (-as some of you sallready know ) the answer is: avoid stranded cables, all over, power too.
 
Old 7th November 2003, 01:05 PM   #24
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Default Re: Can a power cord affect sound quality??

Quote:
Originally posted by sully
Although the other thread started with "can a PC burn in", I (feebly) attempted to re-direct the thread several times into a discussion of can a pc affect sound..

...

I hope this thread can remain focussed on topic; the other did not..

Cheers, John
I'm impressed by your optimism...

Unfortunately, I think too many people prefer to just talk about stuff rather than actually performing experiments (or even just listening).

If it helps, I conducted a listening test to compare 1m of standard, unscreened, multistrand, mains cord and 5m of the same. I could hear no change (even in my imagination).

If this cord is degrading the sound in some way, then the longer one should be significantly worse, shouldn't it? I'm not particularly willing to buy and try an 'audiophile' mains cord until this simple test shows any results.

Cheers
IH

(Quite obviously deaf, and proud of it)
 
Old 7th November 2003, 01:38 PM   #25
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Default Re: Re: Can a power cord affect sound quality??

Konnichiwa,

Quote:
Originally posted by IanHarvey

If it helps, I conducted a listening test to compare 1m of standard, unscreened, multistrand, mains cord and 5m of the same. I could hear no change (even in my imagination).
There are a few possible reasons for this result:

1) The powercord was applied ahead of the entire system and hence was outside the various sonically relevant current loops.

2) The powercord was applied to a piece of equipment with exemplary good powersupply design (or other implemented design measures to break parasitic noise current loops).

3) The powercord applied (between the different length) was inherently sufficiently bad that the extended length did not provide a suitably material disimprovement to be audible.

4) The powercord was applied to a system where the transparency is insufficient.

5) A variety of combinations with varying percentages of the above.

Did you make any tests prior to active blind testing to establish the degree of discrimination allowed by the test system and blind tests (using changes "known/proven" to be audible under blind conditions)?

Sayonara
 
Old 7th November 2003, 01:44 PM   #26
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I believe power cords MIGHT do some chnage...but there are too many other stuff that we can do to make the sound better..other than spending a whole lot on the power cord...do up some other stuff...
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Old 7th November 2003, 02:17 PM   #27
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Default Re: Re: Re: Can a power cord affect sound quality??

Quote:
Originally posted by Kuei Yang Wang
... using changes "known/proven" to be audible under blind conditions


For example? References please!!!
 
Old 7th November 2003, 02:29 PM   #28
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Default Re: Re: Re: Can a power cord affect sound quality??

Quote:
Originally posted by Kuei Yang Wang
Konnichiwa,
There are a few possible reasons for this result:

1) The powercord was applied ahead of the entire system and hence was outside the various sonically relevant current loops.

2) The powercord was applied to a piece of equipment with exemplary good powersupply design (or other implemented design measures to break parasitic noise current loops).

3) The powercord applied (between the different length) was inherently sufficiently bad that the extended length did not provide a suitably material disimprovement to be audible.

4) The powercord was applied to a system where the transparency is insufficient.

5) A variety of combinations with varying percentages of the above
Sayonara
This is right and it works for me ...

Quote:
Originally posted by li_gangyi
I believe power cords MIGHT do some chnage...but there are too many other stuff that we can do to make the sound better..other than spending a whole lot on the power cord...do up some other stuff...
Yes ,
YBA for example recommends a minimum of lenght for theyr cables : 125cm, or multiples ...
I tried it and it works very well ...and not only in my set up.
I use all my cables at 125cm now . For example, between the turn table and the phono pre, a cable of 1 meter sound worse than that of 1.25meters ... You think of cut the cable for the min lenght and with the cable you cut the highs , the basses ... I know it seems some religious things ... but it's true.
The same for the power cords , 125cm or 250cm . It makes the difference.

very !
 
Old 7th November 2003, 03:10 PM   #29
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Default Re: Re: Re: Can a power cord affect sound quality??


1) The powercord was applied ahead of the entire system and hence was outside the various sonically relevant current loops.


This wasn't the case. Does this mean that current/earth loops are the only mechanism worth considering here?


2) The powercord was applied to a piece of equipment with exemplary good powersupply design (or other implemented design measures to break parasitic noise current loops).


Yes, I've taken a lot of trouble to get the grounding right. There are no earth loops. But then saying "my amp has sufficiently good PSRR" implies the statement "my amp isn't influenced by mains cord changes", which is where I started.


3) The powercord applied (between the different length) was inherently sufficiently bad that the extended length did not provide a suitably material disimprovement to be audible.


This seems to imply there is a maximum level of 'badness' beyond which it is not possible to go...


4) The powercord was applied to a system where the transparency is insufficient.


Could be. Obviously, if this is the case I'd be better off pursuing this rather than mucking about with power cords.


Did you make any tests prior to active blind testing to establish the degree of discrimination allowed by the test system


Do you have scale of such things? The system in question has a discriminating power somewhere between 'can hear it if one speaker is not plugged in' and 'can hear it if you put a photograph in the freezer'.

Cheers
IH
 
Old 7th November 2003, 03:23 PM   #30
Previously: Kuei Yang Wang
 
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Default Re: Re: Re: Re: Can a power cord affect sound quality??

Konnichiwa,

Quote:
Originally posted by fcserei
For example? References please!!!
References not even needed. May suggest the following Items which I would consider as "generally known audible"?

1) Polarity Inversion in one channel only.
2) Swap stereo channels.
3) 128kbps MP3 vs CD

I think few people would argue about the audibility of the above, yet I would have no problem constructing a ABX Test using a basic setup, suitably bad arrangements etc. and apropriate statistics (.05 level of significance) which would result in a fair number people scoring no significant difference.

Sayonara
 

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