Headphone with active noise reduction

A noise reducing headset has one or more of the following features: (a) pair of earcups (11,12) each seated in a yoke assembly (14,15) mechanically coupled by a headband (13) enclosing a flat spring formed with a slot that runs the length of the spring accommodating electrical wires (24) electrically interconnecting electrical elements in the earcups, (b) each earcup having active noise reducing circuitry, (c) each earcup including a loudspeaker driver (31) located off center in the earcup to allow an internal cavity inside each earcup to accommodate a loudspeaker driver (31), a microphone (35) and an electronic printed circuit board (32) and one of a battery (37) and plug assembly (33), (d) one of the earcups accommodating a detachably secured plug assembly (33) having a sensitivity switch (33A) covered by the earcup when the plug assembly is fully seated in the earcup, (e) the other earcup having a battery door (41) that may be opened to allow insertion and removal of the battery and covered by a yoke assembly (14) when the headset is worn by a user with the battery fully seated in the earcup.