Forgive me if I am way behind the times, but I thought that SQ never decodes in the rear channels completely with real separation, but always a bit blended. And no decoder could overcome this. I'd be glad to hear otherwise.
But speaking of Derringer, I remember him saying what was wrong with 70s quad in an 80s interview, he said "it didn't work". He was one of the few artists/producers that had every album he was involved in get a quad mix. His own, Edgar's, and Johnny's as well. Yet the SQ format let everyone down (except for the ones with a Tate or Surround Master). CBS not issuing quadraphonic reels in the 70s is one of life's great minor tragedies.
Thankfully AF has come along and is righting this wrong that was done to my childhood which I am still in recovery over.
I guess it's mix and (I suspect quality of encode) dependent for each individual disc.. there's blending going on, some mixes are distinctly better at masking it than others.. many times you only notice the lack of true discrete separation if you go right up to a speaker and then you can hear say lead vocals in the rear channels that are much more dialed down in the rear on the Q8 equivalent..
..to give you an idea of how effective the rear left and rear right separation on the SQ Surround Master can be, with stuff other than the really overt like a round the room 360-degree pan - which the Surround Master does incredibly well btw - in the opening on track 1 of Poco's Cantanamos album ("Sagebrush Serenade") thru the SQ Vinyl Surround Master you get;
- the opening solo acoustic guitar rear right,
- then guitar comes in rear left (with definite separation across the rear speaker pair)
- as lead vocals come in front left
- and then harmony vocals kick in centre front and right front
- and then it all opens up into all channels..
..it's simple but very effective.
Rick Derringer might like to hear his buddy Edgar Winter's "Jasmine Nightdreams" SQ LP decoded by the Surround Master.. it most definitely "works"
Meantime AF are performing minor miracles with every new QUAD SACD they release, I'm seriously thankful.. Long may it continue! :upthumb