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A-weighted sound level accordance with paragraph Acoustical Performance American National Standard anechoic chamber anechoic room automatic increases Automotive Engineers axial position Band Filter Sets Commonwealth Drive decreases in frequency drain holes open electromechanical siren electronic siren Emergency Vehicle Sirens Enforcement Standards Laboratory high-low input voltage Institute of Justice Law Enforcement Standards LESL manual mode measure the sound measurement instrumentation system meets the requirements microphone mode of operation National Institute National Standard Methods NIJ standard nominal cycling rate normally mounted external on-axis sound level operational mode paragraph 5.4 passenger space Portland Cement produces a tonal projector(s requirements of paragraph siren assembly siren axis siren horn siren or speaker siren shall operate siren that produces siren under test Society of Automotive sound level measurements sound level meter sound pressure level Technology Assessment Program tested in accordance tonal pattern Turn the siren turntable U.S. DEPARTMENT voltage of 13.6 wail wattmeter yelp mode