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Re: Audio recording hardware

On Thu, 1 Mar 2007, Andrei Popescu wrote:


On Wed, 28 Feb 2007 22:11:04 -0600
"Russell L. Harris" <rlharris@oplink.net> wrote:


* Ron Johnson <ron.l.johnson@cox.net> [070228 18:21]:

I remember reading an article in a German audiophile magazine
about a device to demagnetize CDs. The author claimed the sound
to be much better after demagnetizing.


Demagnetize something that relies on lasers?


With a mass-produced CD, there is nothing to degauss.  A reflective
layer of aluminum is deposited on a plastic substrate.

Are you sure the article wasn't talking about the realm of analogue
tape?  Magnetic tape playback heads tend to become slightly magnetized
with use, so that periodic demagnetizing is necessary.  This is
somewhat akin to the need for periodic degaussing of a CRT.  But since
the introduction of ferrite heads, this may no longer be a problem.


For all you non-believers (sorry, too much religion in recent threads)
here is a similar article:

http://www.6moons.com/audioreviews/furutech/rd2.html

Regards,
Andrei
--
If you can't explain it simply, you don't understand it well enough.
(Albert Einstein)


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...and there's more here:

http://www.6moons.com/audioreviews/furutech/rd1.html
But I have to say that it strikes me as quite bizarre, frankly. The idea is that somehow magnetization of impurities in the label and aluminum layers will cause the laser to fail more frequently, thereby invoking the error-correction circuitry, thereby resulting in loss of sound quality. This ought to be fairly easily testable by reading binary data repeatedly from a CD, instead of the shenanigans the review goes to to evaluate the sound quality on output. But I would think any even vaguely modern (say, 20 years old or less) CD player would have sufficient buffering to make this problem a nonissue. 

Andy


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Andrew J Perrin - andrew_perrin (at) unc.edu - http://perrin.socsci.unc.edu
Assistant Professor of Sociology; Book Review Editor, _Social Forces_
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