Sound attenuation of TDH-39 earphones in a standard headset and in a noise-excluding headset.
The sound attenuation of TDH-39 earphones with MX-41/AR cushions has been measured in two different configurations: 1) earphones attached to the usual audiometric headband, and 2) earphones mounted in a noise-excluding headset, ME-70 from Madsen Electronics. The measurement method was in accordance with ISO 4869-1981 for hearing protectors, using 1/3-octave noise bands in a diffuse field. For almost all frequencies, the attenuation results (config. 1) are lower than the guidance values given in the audiometric test method standard, ISO/DIS 8253. The noise-excluding headset (config. 2) provides a 7-10 dB better attenuation.
Poulsen
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Acoustics Laboratory, Technical University of Denmark, Lyngby.
D001299:Audiometry / Q000295:instrumentation*; D001309:Auditory Threshold; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise