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An external sound source amplifier 50 is also mounted in at least one of the headphone assemblies 12, 14, for connection to an external source of sound, e.g. via a female jack with jack switch 52, for supplying sound from the external source of sound to the user, such as an MP3 player 51 in FIG. 2, a CD player, a radio, or other source of electronically or electrically created sound.
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