Everything you ever wanted to know about JVC's CD-4 discrete 4-channel recording system.
When it became obvious that the next big advance in audio was going to be 4-channel records many manufacturers started independent research.
Most of them took the easy way; confining themselves to conventional record production technology they ended up with 2-channel matrix records which produce pseudo 4-channel sound.
A few though that maybe discrete 4-channel records where possible - but only one, JVC, saw this research through to actual production.
4DD-5, 4ME-4800, 4MM-4600, 4VC-5244, 4VN-770, 4VN-990, 4VR-5414, 4VR-5445, 5911, 5944, VN-5101, VS-5399
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