James Gabbert of KIOI (K-101) in San Francisco and returned to Lake
Oswego very excited. K-101 had successfully transmitted true
four-channel audio for the first time on a single FM station using
Quadraplex, a process invented by Lou Dorren. The FCC was concerned,
however, with certain technical issues that had to be resolved before
it would give Quadraplex its blessing.
http://www.rockininquad.com/joel%20m...20memories.htm

Quadraphonic Discography "Radio Broadcasts"
http://members.cox.net/surround/quaddisc/quadradi.htm

qua-dra-phonically the sound - echoes all around the inside of my head
~ RHF