Ahh... that albums been released in so many surround formats that I get turned around. But, I thought the SACDs were in 5.1 only (as the Warner Japan version I have is). I forgot/didn't realize the boxed set was the SQ encoded mix and discrete mix. I stand corrected on both then!
well it's a fabulous album and one of those all-time stone cold classics I guess, kinda deserves all the reissues I suppose.. the 40th box is pretty comprehensive and a dinky little set. I imagine it'll get redone for the albums' 50th anniversary, on Blu-ray Audio that will stop working by its 52nd anniversary