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This Appendix is Mandatory
Rooms used for audiometric testing shall not have background sound pressure levels exceeding those in Table D-1 when measured by equipment conforming at least to the Type 2 requirements of American National Standard Specification for Sound Level Meters, S1.4-1971 (R1976), and to the Class II requirements of American National Standard Specification for Octave, Half-Octave, and Third-Octave Band Filter Sets, S1.11-1971 (R1976).
Octave-band center frequency (Hz) | 500 | 1000 | 2000 | 4000 | 8000 |
Sound pressure level (dB) | 40 | 40 | 47 | 57 | 62 |