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A Low-Noise High-Output Capacitor Microphone System

The dynamic range of a capacitor microphone has been considerably extended by means of an advanced FET feedback amplifier. This microphone delivers +20 dBm into 600 ohms at maximum sound pressure levels of 110, 125, or 140 dB. Its A-weighted noise level of 15 dB is contributed mostly by the capsule instead of the amplifier.

JAES Volume 25 Issue 5 pp. 278-283; May 1977
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AES - Audio Engineering Society