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absorption coefficient Acous acoustic impedance acoustic resistance acoustical system air gap amplifier amplitude angle average axis baffle calibration capacitance carbon microphone cavity compliance components condenser microphone constant curve CYCLES PER SECOND decibels determined diaphragm direct sound directional characteristics distance distortion effect electrical circuit electrical impedance equation flux density force FREQUENCY IN CYCLES frequency range harmonic higher frequencies horn input intensity loud speaker magnetic mass measured mechanical impedance mechanical system method micro motion noise meter obtained oscillator particle velocity phase piston plane plate quency radiation ratio Rayleigh disc reactance reflected sound reproduced resonance frequency response characteristic reverberation ribbon microphone SECOND Fig sensitivity shown in Fig sound energy density sound pressure sound source sound wave source of sound standing wave surface telephone receiver theatre tion unit vacuum tube vibrating voice coil voltage volume current wall wavelength