![]() Even the best-of-the-best quad decoder, the Fostgate Tate 101A (which didn't come out until the late 70's), can only achieve about 25dB of front/rear separation which pales in comparison to a discrete quad 8-track tape. The problem was that the SQ decoders that existed circa 1973 were terrible - they were 'non-logic' units which only provided 2-3dB separation between front and rear channels, so the 'quad effect' is rendered almost negligible and what you hear is much more of a 'double stereo' effect. Rather than ask EMI UK for a discrete 4 channel tape, Capitol just decided to decode the SQ master they had and make quad 8-tracks from it. The US Q8 should be discrete, but it's not - I assume EMI UK only sent Capitol USA a SQ quad-encoded stereo tape to make their quad LP's. So the UK Q8 is the only place to hear the original discrete mix. ![]() US Quad 8-Track: 4 channel master -> SQ Encoder -> 2 channel SQ encoded sub-master -> SQ Decoder ->4 channel sub-master ->Quad 8-Track UK Quad 8-Track: 4 channel master -> Quad 8-Track US Quad LP: 4 channel master -> SQ Encoder -> Quad LP UK Quad LP: 4 channel master -> SQ Encoder -> Quad LP Click to expand.All of the releases use the same mix, it's just the lineage is different.
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