Multi-part Document
BS EN ISO 4869 - Acoustics. Hearing protectors

This is a multi-part document divided into the following parts:

• Part 1 Acoustics. Hearing protectors. Subjective method for the measurement of sound attenuation
• Part 2 Acoustics. Hearing protectors. Estimation of effective A-weighted sound pressure levels when hearing protectors are worn
• Part 3 Acoustics. Hearing protectors. Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
• Part 4 Acoustics. Hearing protectors. Measurement of effective sound pressure levels for level-dependent sound-restoration ear muffs