1. 
   quadriphonic
   quadriphonic, quadriphonics, quadrophonic All of these are variations in form of quadraphonic, et al.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1814/3
   
   
2. 
   quadriphonic
   quadraphonic, quadriphonic, quadraphonics Using a four-channel system to record and reproduce sound. The four separate signals may be fed to individual loudspeakers placed in the corners of a room.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1814/
   
   
3. 
   quadriphonic
   1) Quadraphonic 2) Quadrasonic 3) Quadrisonic 4) Stereo 5) Stereo system 6) Stereophonic system
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/quadriphonic/1
   
   

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