That's one thing I liked ....no loved , about the German audio recording industry.
Most of what I've seen is that they are all Single Inventory matrix quads . Be they Classical or Rock .
Metronome/OHR/COSMIC COURIER , Bellaphon Bacillus , BASF , Acanta , Eurodisc , Ariola , Horzu , Electrola, etc.
For some reason the German Record Companies just seemed to favour their Quad matrix recordings. (This may be true for Japan as well).
So why the f$k couldn't the North American Record Companies follow suit ? (with a small number of exceptions)
Like Creative World , CTI/KUDU , Golden Crest , Ovation, Black Jazz ,ABC/Impulse/Bluesway/Blue Thumb , Passport , and a few with 1 or2 quads .( and perhaps Project 3)
Capitol Records initially had SQ and Q8 ......and then went solo with a Q8 only policy ,but did the reverse with their Angel SQ Recordings ???
I think there were too many old farts in charge of that Company , stuck in the past, 1940's 50's and with no foresight !
Simple my very good friend .
My vinyl album is The Polydor 1975 Movie Soundtrack . And yes it's different , it's much shorter ,by at least 10 minutes +.
It's always been an unmarked QS encoded album.....from day one. They couldn't and would not put the mono 5th channel (discrete center) on the album intact without affecting the 2ch QS encode.
But my edumacated guess is they did something to muck up the 2-channel QS encoded Discrete with some form of mixdown.
FWIW I have the U. S Copy on Polydor which is the one that The Quadrophonic Record Center in London shipped to me back in the 70's. Also I have the Canadian pressing on Polydor . As expected both copies are identical .
Played back via my Sansui QSD-2 it sounded pretty good. Especially the 2 Clapton tracks, Elton John , and Tina Turner.(Also some of Pete Townsend's solo tracks ,and Keith Moon's Wicked Uncle Ernie bit )
Audio engineers such as the famous A E S Member, John Eargle (quad engineer) picked this album as one of his favourite QS albums and wrote a short review of this very album he recommended for playback in QS.
Sources in both British Magazines and U.S. Magazines confirmed this album to be a "Quiet Quad" ,or "Closet Quad" or just an unmarked QS album as did also Sansui .
Polydor Japan also had the QS Quintaphonic emblem emblazoned on the O B I strip on the vinyl album they sold and promoted.
Although it was later made available on CD ,I never had it.....but should have. I blame my procrastination for that mis step.
In my opinion they should have made the entire soundtrack on vinyl LP available as it's one of the few Rock Movie's that starts off in the Who's music from start to finish.
Fizzy luvn' The Who's Music Epic.
Edit:
It's also worth noting Polydor never disputed this reported QS encoded album .......Nor did Sansui ?!!!
And they both had plenty of opportunities .