Here's the first 30 seconds of "Gypsy" - rear channels only - from the original quad reel, SACD, and Blu-Ray. I'm fairly certain than all three are sourced from the same four-channel master mixed by Tony Clarke & Derek Varnals.
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If the multitracks no longer exist and the quad tapes are all that's available, I'm not sure why they couldn't give us an unaltered transfer of the quad mix instead of (twice now!) trying to doctor them up into a pseudo-5.1 experience.