Stereo audio headphone apparatus

A stereo audio headphone apparatus comprising:

• a master headphone unit comprising:
• a master housing to be independently carried behind an ear of the user,
• master circuitry carried by said master housing and comprising a stereo audio source and a wireless transmitter coupled thereto,
• a master audio output device carried by said master housing and coupled to said master circuitry for playing a first stereo audio channel from said stereo audio source,
• a master audio input device carried by said master housing and coupled to said master circuitry, and
• a first independently settable frequency equalizer for the first stereo audio channel carried by said master housing;
• and
• a slave headphone unit comprising
• a slave housing to be independently carried behind another ear of the user,
• slave circuitry carried by said slave housing and comprising a wireless receiver cooperating with said wireless transmitter,
• a slave audio output device carried by said slave housing and coupled to said slave circuitry for playing a second stereo audio channel from said stereo audio source,
• a slave audio input device carried by said slave housing and coupled to said slave circuitry, and
• a second independently settable frequency equalizer for the second stereo audio channel carried by said slave housing;
• wherein said master circuitry is operable in a pass-through mode with audio sensed by said master audio input device being delivered to said master audio output device via said first independently settable frequency equalizer;
• and
• wherein said slave circuitry is operable in a pass-through mode with audio sensed by said slave audio input device being delivered to said slave audio output device via said second independently settable frequency equalizer.