The open circuit output level is 84 dB below 1 volt/dyne/cm², 64 dB below 1 volt/10 dynes/cm². The three basic patterns available are non-directional, figure eight, and cardioid. The 639-type Microphone is a general purpose magnetic microphone with directional characteristics which are selectable by means of a switch. Cardioid directional microphones Listen to a Model 639B in its R, D, and C positions.Īn Altec 639A with its three-position pattern selector switch.Īn Altec 639B with its six-position pattern selector switch.Ħ39A and 639B Cardioid Directional Microphones
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