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Design and Evaluation of Accelerometer-Based Motional Feedback

The electro dynamic loudspeaker is often referred to as the weakest link in the audio chain due to low efficiency and high distortion levels at low frequencies and high diaphragm excursion. Compensating for loudspeaker non-linearities using feedback or feedforward methods can improve the distortion and enable radical design changes in the loudspeaker that can lead to efficiency improvements. In combination this has motivated a revisit of the accelerometer-based motional feedback technique. Experimental results on an 8-inch subwoofer show that the total harmonic distortion can be significantly reduced at low frequencies and large displacements.

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AES - Audio Engineering Society