CD-4

CD-4

This is the “odd man out” in the quad world. Extremely ‘fine’ grooves were etched onto the vinyl record to provide frequencies between 35,000 and 50,000 hertz. The CD-4 demodulator sensed these high frequencies then converted them to a range of around 100 to 15,000 hertz. These frequencies were then sent to the amplifier and on to the rear channels.

A matrix decoder can not sense the high frequencies on a CD-4 record, it can only synthesize the stereo output of a CD-4 QuadraDisc LP.

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More CD-4

More CD-4

My own experience with CD-4 led me to stick with matrix-type quads. To hear a quad sound from CD-4 encoded vinyl I just send it through my Vario-Matrix decoder and let it synthesize a quad sound. However, there ARE those who use and enjoy CD-4. Cai Campbell is a quad expert with an opposing view. Here is his opinion:

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