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In Reply to: Re: demagnetizing CDs? posted by Norm on April 15, 2002 at 13:31:11:
Well, from the theory side, the only thing that make a CD sound better vis-a-vis CD treatments is something that can reduce the bit errors on the CD. The digital data is buffered, so timing isn't an issue at the reading stage. All that matters is "am I getting my ones and zeros". Of course, a CD that is vibrating in the player, even if it doesn't have more bit errors, could conceivably cause power-supply or acoustic feedback to the rest of the system and affect the sound -- but that doesn't have anything to do with the demagnetization issue.So -- how can a demagnetizer change the bit error rate? Nothing is magnetic! However, the demagnetizer can cause eddy currents in the aluminum coating. I don't know the magnitude of these currents, but there is no way they'd be large enough to cause any structural change to the CD (the aluminum would heat up far less than your demagnetizer). And, if they did cause a change, I would be worrying about degrading my disk -- not making it better, as the results of such a treatment would likely be cumulative! In reality, I can't imagine the demagnetizer doing anything. You might as well talk about the improvements derived from cryogenic treatment, or puting them under pyramids. Sorry -- but this one really smacks of "belief of the user" rather than any conceivable theory. A company can't just put out a product and say "it might work for you, but we can't imagine why".
Now, anti-static sprays, cleanings, blackened edges -- all could conceivable improve the bit errors. But demagnetizing a non-magnetic material???? Sorry, but I'd have to hear it to believe it. I can hear the difference between digital cables (good vs. bad -- but not always good vs. good), interconnects, speaker cables, etc., but I doubt I'll run out and get a demagnetizer. Happy listening.
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Follow Ups
- Re: demagnetizing CDs? - audioNeil 04/15/0214:53:06 04/15/02 (2)
- Is our theory complete? - Norm 09:21:02 04/16/02 (0)
- Not necessarily the bit error alone - highendman 17:37:56 04/15/02 (0)
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