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absorption according acoustic impedance acoustical system amplitude analogy angle applied approximation armature audio axis calculation cetera characteristic characteristic impedance circuit of Figure coefficient compliance components constant corresponding d'Alembert's equation decrease defined Definitions designed diaphragm diffraction diopter directivity disk displacement distance driver electrical electroacoustic electrodynamic element energy equal equations equivalent example ferromagnetic filter frequency range function groove horn infinite baffle input introduced inverse Let us consider linear losses loudspeaker magnetic magnetic circuit magnetic tape magnetostrictive maximum mechanical medium microphone mode modulation motion noise nonlinearities obtained octave output pick-up head piezoelectric pipe piston plane propagation properties quality factor quantities radiation impedance ratio recording relation represented resistance resonance response curve root-mean-square value signal sinusoidal sound field sound intensity sound pressure sound pressure level sound rays specified speed of sound stereophonic stylus stylus tip surface transducers voltage volume velocity walls wave wavelength zero