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absorption acoustic compliance acoustic impedance acoustic mass acoustic power acoustic resistance analogous circuit articulation index assumed average band bandwidth capacitance cavity circuit of Fig cone crystal curve cycles per second decibels determine diameter diaphragm direct-radiator loudspeaker directivity factor directivity index directivity pattern distance electrical element enclosure energy density equal equation example frequency range function of frequency given by Eq horn impedance-type infinite baffle length loudness level low frequencies magnitude measured mechanical impedance microbar microphone mks acoustic ohms mobility mobility-type mode of vibration noise open-circuit voltage particle velocity piston plane power level quantity quency radiation impedance radius ratio reactance resonance frequency response reverberant shown in Fig side sound energy density sound field sound pressure level sound source sound wave spherical square meter surface Table temperature terminals throat transducer tube voice coil voice-coil volume velocity wall wavelength zero