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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: It did seem like a strange thing to say. posted by jneutron on January 8, 2007 at 10:01:34:
Hi.It's a shame that so many still don't know how a conventional CD (technically we called a CD-DA (digital audio)vs CD-ROM)) is built & works despite we play CD music day in day out.
A CD-DA is an injection molded disc of clear polycarbonate plastic with a spiral track of impression of microscopic gapped bumps
as per the audio digital data recording molded on its surface. A very thin reflective aluminum film layer is sprayed onto the impressed disc surface, protected by another spray of thin layer of clear acrylic on it.The recorded audio signals are encoded as gap & bumps on the spiral track, read by the optical laser senor as a digital 1 on the gaps & digital 0 on the bumps. It is the aluminum reflective coating that provides the readable reflective media for the laser reader.
Can the CD magnetizer experts explain how such optical pickup system using a reflective aluminum surface can be benefitted sonically by passing a strong magnetic field on it ????
Also, aluminum metal is a paramagnetic material, like oxygen, calcium, platinum & magnesium etc etc. It is NOT a perromagnetic material which are attracted to magnetic fields. Aluminum do NOT, repeat, not retain ANY magnetism when an externally applied magnetic
field is removed from it.So, technically it will not be peromanently affected by any magnetic field magnetic field to it.
My audition sesssion on a CD magnetizer confirmed the above theory.
Once the strong magnetic field is gone, the CD sounds back to normal.
I was sweating my pants when I first heard the horrible sound coming out from my favourite test CD immediately after the so called magnetic treatement. I thought my belowed test CD was trashed. But thanks goodness, aluminum does not retain ANY magnetism. It sounded back nice after a short while.IMO, it is a redundant bowel movement.
Likewise, whoever experts tell you the sun comes out from the west, would you check it out before taking in?
c-J
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Follow Ups
- If you knew how a CD works, you'd agree to my "opinion". - cheap-Jack 11:59:41 01/08/07 (7)
- I didn't disagree. - jneutron 12:21:37 01/08/07 (6)
- Wrong, don't forget aluminum is a paramagnet, not non-magnetic. - cheap-Jack 12:57:31 01/08/07 (5)
- I kinda knew that about aluminum...use it a lot in magnets.. - jneutron 13:10:40 01/08/07 (4)
- Yes, it could be a thermal shock effect. - cheap-Jack 13:22:45 01/08/07 (3)
- Re: Yes, it could be a thermal shock effect. - jneutron 13:29:52 01/08/07 (2)
- But the laser sensor reads only 1 or O. - cheap-Jack 13:42:54 01/08/07 (1)
- Actually, it determines bit value by the reflection coefficient. - jneutron 13:51:39 01/08/07 (0)
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