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Piece of cake

Then why does a "degaussed" disc sound better?

Because the read-head does not move away from the disk due to highly charged areas as they pass under the head. The air-bearing under the head is more constant in thickness.

A carved-and-centered disc?

Probably half mechanical, due to roundness defects and "wobble" that is reduced and half due to the changes in the internal reflections that were causing noise during the read of the pits.

A cleaned/polished disc?

Simple - same reason why a multi-coated lens in a binocular makes the image sharper.

A matted disc?

Eliminates resonance as the disk is spinning. If you take a standard CD and hold it gently in two fingers on opposite sides, and then pluck it like a guitar string with fingers on the other hand, you will find that it makes a nice little bell Rings like a bell for sure. Now, put a rubberized coating on it or glue a soft rubber-like mat to it and do the same experiment. The ringing now changes to a "thuck". End of story. These resonant vibrations cause the disk to moave closer and further from the head as it is trying to read the pits. When either closer or farther than the focal point, it will cause poor reads of the pits.

An Intelligent-Chipped disc?

Black Magic I guess. What is it?

Steve N.


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