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Aaron Clinton

Koss PRO-4, PRO-4A and Pro/4 AAA Plus headphones

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Almost a dead-ringer for the early-model Sharpe HA-10, Koss's PRO-4 ($45) is readily distinguishable by a large knurled protuberance sticking out of the lower part of the right-hand phone. This, in case you've wondered, is a mounting for a "boom-type" lip microphone, for use in speech labs and for communication purposes. (Sharpe and Permoflux also provide facilities for attaching a lip-mike.)
63koss4.jpg
Sun, 12/01/1963

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