stereophonic

stereo- +‎ -phonic by analogy with stereoscopic

stereophonic (comparative more stereophonic, superlative most stereophonic)

1. of or pertaining to sound reproduction using two channels to give a more natural two-dimensional sound distribution

   Coordinate terms: monophonic, quadraphonic

   • 2000, Richard Osborne, Herbert Von Karajan: A Life in Music, page 349:

     […] this 1953 Hansel und Gretel is a classic example of how a well produced mono recording can seem more stereophonic than many of its later stereophonic rivals.

• binaural