A comparison of three HA-1 couplers.
The use of 2-cm3 couplers for measuring the output of an ER-3A earphone has been recommended. The purpose of this study was to compare the acoustic output of three commonly available couplers and to study the intra- and inter-examiner reliability with which those measurements may be performed. While the repeatability of measurements, at least for clinical purposes, was good even for hand-held coupling of the earphone to the couplers, differences between couplers were observed. These differences were influenced by the positioning of the sound-outlet orifice relative to the interior, top wall of the couplers' cavities. A recommendation for 2-cm3 coupler calibration of the ER-3A earphone using a commonly available adapter was made.
Larson
V D
VD
Audiology Research Program (151), Veterans Administration Medical Center, Augusta, Georgia.
Cooper
W A
WA
D000162:Acoustics; D000399:Air Pressure; D000669:Amplifiers, Electronic; D006310:Hearing Aids / Q000592:standards*; D013016:Sound