Loudspeakers. Methods of measuring electro acoustic parameters
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Microphones. Methods of measuring electro acoustic parameters
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Stereophonic headphones. Methods of measurements
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Subscriber loudspeakers. Gneral specifications
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Microphones. General specifications
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Microphones. Requirements to mechanical attachment
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Microphones and earphones for speech communications
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Horn type loudspeakers. General specifications
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Microphones. Specifications
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Loudspeakers. Methods of electroacoustic tests
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Microphones. Methods of measurement of electroacoustic characteristics
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Subscriber loudspeakers. General specifications
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