This is a fantastic release!
@blue.monk's review absolutely nailed it. This has to be the most discrete surround mix I've heard from a four-track source: it pushes the separation envelope even further than Steven Wilson's 4.1 mix of Jethro Tull's
This Was.
Several tracks ("To Kingdom Come", "Caledonia Mission", "We Can Talk", "This Wheel's On Fire") have "Columbia Q8"-style mixes with different instruments hard-panned into the corners. "We Can Talk" in particular is a hoot with the piano in left rear and the call-and-response vocals popping out of different speakers.
"To Kingdom Come":
"We Can Talk":
Other tracks with less complex arrangements or less instrumentation ("Long Black Veil", "Chest Fever", "I Shall Be Released") feature long stretches of ambience in the rears, but not without the occasional discrete burst of backing vocals or horns.
The only track that's truly ambient all the way through is, unfortunately, "The Weight". It almost sounds like a SPECWEB upmix, with most of the music in the center channel and very little going on in the four corners. IMHO, if you want to hear a decent surround mix of this track, cue up the re-recorded version (with the Staple Singers) from
The Last Waltz DVD-A. The original recording just doesn't have any discrete surround potential.
Thanks to a kind fellow member, I was able to compare this new mix with the old DVD-A version, credited to Don Gilbert. Clearmountain's version is the clear winner. The old mix is mastered louder and isn't very discrete at all. I also noticed that, as with most Clearmountain mixes, the center channel is extremely active, while the old mix doesn't utilize it nearly as much. One point I'd give the old mix over the new one is that the organ intro to "Chest Fever" comes mostly from the rears, whereas the new mix has it isolated in the center channel.
"Chest Fever" (2018 Blu-Ray):
"Chest Fever" (2002 DVD-A):
Even "The Weight", which some have reported to be better on the old DVD-A, appears to be more-or-less "double stereo". There is more going on in the rears than the new mix, but I struggled to identify any element not also present in the fronts. One interesting difference between the two is the way the center channel is used: the old mix has isolated acoustic guitar and harmony vocals in the center, while the new mix has the drums in the center.
"The Weight" (2018 Blu-Ray):
"The Weight" (2002 DVD-A):
Grab it for the warehouse price if you can, it's an absolute steal. Gotta give it a 10. Would love it if the same team tackles The Band's self-titled second album next...