Abstract: An improved headphone arrangement in which a first audio signal is coupled to a speaker in each headphone and a second audio signal, usually monaural, is coupled to an amplifier and then to the same speaker in each headphone via an isolation network. Switching circuitry are also provided so that the speaker may be connected directly to the second audio source without amplification. The headphone is used as a musician's practice aid or for track-making or similar purposes. The first audio signal is preferably a prerecorded signal while the second audio signal is preferably the output of the musician's electronic instrument.

Abstract: An improved quadraphonic headphone arrangement in which a first audio signal is coupled to a speaker in each headphone and a second audio signal, usually monaural, is coupled to an amplifier and then to a second speaker in each headphone. Switching means are also provided so that the second speakers may be connected directly to the second audio source without amplification. The headphone is used as a musician's practice aid or for track-making or similar purposes. A prerecorded signal is coupled to the first speakers while the musician's electronic instrument output is coupled through the amplifier to the second set of speakers.