Francis Drake
Pirating aboard the Golden Hind
Am with Owen on this. I suspect it's nothing but random phase in the records, be they commercial recordings or advertisments, that are artificially being placed somewhere in the listening area.Just because things appear in the rears does not mean the broadcast is deliberately DS encoded. It's like playing stereo music through QS, you get something just not what was intended.
Anything else is probably just wish full thinking.