Interesting timing. I just pulled the JVC BN-5 Biphonic Processor out of the closet
The unit always worked good for me in eliminating cross talk on binaural recordings and the realism that one can get with headphones is pretty darn close using loudspeakers.
It is good unit and is very quite for the time period of the electronics.
I don't recall any recordings to recommend as it was many years ago I was using it in that capacity and most were ambient sounscapes or nature recordings.
I mainly used the unit for home recordings I did with a dummy mic and using it to expand stereo recordings.
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The quad version was never produced but I did get a circuit diagram they used in the patient process when I contacted JVC engineers in the late 80's. Not sure where that is hiding at the moment.
Here is the link to the circuit diagram I posted years ago
Q-bifonic release(s) list NEEDED !