Method of Controlling Sound Reproduction of Enclosure Mounted Loudspeakers

A sound reproduction assembly for an enclosure mounted electrodynamic loudspeaker, comprising:

• an audio signal input for receipt of an audio input signal supplied by an audio signal source, an output amplifier configured to receive the audio input signal and generate a corresponding voice coil audio voltage at a pair of output terminals connectable to a voice coil of an electrodynamic loudspeaker,
• a current detector configured for detecting a voice coil current flowing into the electrodynamic loudspeaker in response to the application of the voice coil voltage;
• and
• a signal processor configured to:
• detecting one of an impedance and an admittance of the loudspeaker across a predetermined audio frequency range based on the detected voice coil current and a determined voice coil voltage,
• determining a fundamental resonance frequency of the loudspeaker based on the detected impedance or admittance,
• comparing the determined the fundamental resonance frequency of the loudspeaker with a nominal fundamental resonance frequency of the loudspeaker representing a nominal acoustic operating condition of the electrodynamic loudspeaker,
• detecting a change of acoustic operating condition of the electrodynamic loudspeaker based on a frequency deviation between the determined fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker,
• attenuating a level of the voice coil audio voltage in response to the frequency deviation meets a predetermined frequency error criterion.