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A Stable Laboratory Standard Condenser Microphone

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A laboratory standard microphone must provide dependable calibration stability, satisfactory performance, and reliability. The rugged construction of the Kellog microphone and a spring-loaded rear electrode assembly are intended to maintain constant diaphragm tension for improved stability. Appropriate modifications of the acoustic controls provide either a pressure-type or a free-field type of microphone. Each microphone has uniform characteristics and meets the ASA performance requirements for its type. Supporting performance data and other information relative to condenser microphones are presented.

JAES Volume 2 Issue 4 pp. 234-238; October 1954
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AES - Audio Engineering Society