Originally posted by Dave2002
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The CD-4 system developed by RCA was superior to the matrix systems, using a high frequency carrier to encode rear channel information and give a high degree of separation. The problem was that it was necessary to have a pickup capable of a very extended frequency response, and most cartridges wore the carrier out after a few playings. The good side of this was that it spurred the development of better stylus configurations and the excellent moving coil cartridges we can still buy today.
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