I tried looking for this info in the forums, but I can't seem to find it. Is there a place where there is a list of "stealth" quads?
I've had Boxed since it was released on the 4 LPs, it is encoded in SQ, I haven't played it through the Involve SM2 yet, and the last time I listened to it in Quad was circa 1977 as a student through my home made SQ decoder! I can't remember how well they sound in surround. Mike Oldfield's "Exposed" live double LP is also in SQ and decodes well through the SM2. So the Ommadawn LP in my 1975 UK Boxed has Stereo/SQ Quad on the label, yours should look the same, see belowMaybe someone here knows the answer to this. I have had a German copy of Mike Oldfield’s Boxed for many years (vinyl). The only reference to Quad is in the booklet; LPs are marked Stereo. Playback in SQ yields only ambiance in the rears. I concluded that these records were not SQ encoded. I very recently obtained a UK vinyl release marked “Stereo/SQ Compatible”. These also yielded the same results in SQ. Sounds like the same mix but the mastering was different. The German copy used some compression. QS decoding actually was better but with something suggesting separation. I’m going to try some of the other matrix coefficients to see if I can get better results. BTW, my A/B testing was limited to Ommadawn and the Collaboration discs.
Does anyone know for sure what encoding was used on this release?
My proof is what comes out of the decoders.
I know about phase relationships causing accidental RM/SQ/EV/Dyna back channel information, but SQ back modulations, H back modulations, and UMX front and back modulations don't happen by chance very often.
The SQ left back and UMX center front are 90 degree shifts with the left channel leading the right channel (clockwise).
The SQ right back, H center back, and UMX center back are all 90 degree shifts with the right channel leading the left channel (anticlockwise).
These do not often occur by accident. And when they do happen by accident, they happen at certain frequencies, but not others. Since the parts stay in the same locations with different notes, it indicates that someone put these modulations into those recordings on purpose.
The musical arrangement also gives me clues.
I found all six fundamental SQ modulations on most of my Vangelis albums. The early ones do not have this. "Heaven and Hell" is striking in SQ, with different parts in the different positions. But there are no primary parts at center back, just reverb and pads. I even checked it with my oscilloscope to make sure. There are circular patterns visible that do not happen with ordinary stereo recordings. The same effect is in "Chariots of Fire" and "Opera Sauvage ".
- The synthesizer used in the Vangelis recordings might output quadrature signals from the oscillators for some reason.
Try listening to the movie soundtrack albums through decoders, rather than demanding proof from some documented source. The ones that are all music by one group of musicians probably have separate mixes done by the group. But the ones that contain cuts of dialog or action from the film have Dolby Surround, at least on those cuts.