EN 60318-3:1998 Electroacoustics - Simulators of Human Head and Ear Part 3: Acoustic Coupler for the Calibration of Supra-Aural Earphones Used in Audiometry
2015EN 60318-3:2015 Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
1998EN 60318-3:1998 Electroacoustics - Simulators of Human Head and Ear Part 3: Acoustic Coupler for the Calibration of Supra-Aural Earphones Used in Audiometry