I'd love to hear River Deep, Mountain High in Atmos or 5.1/quad for that matter. Bring it!
A wall of sound indeed.
Recorded at Gold Star in the Spring of '66. We would be lucky if they were 4-track by that point. Phil Spector might've even still been using 3-track for all we know. Doubt it would make for much of a surround sound mix. Even if it's 4-track, it's probably lead vocals, backing vocals, band track and one more for overdubs.