Current driven loudspeakers have previously been investigated but the literature is limited and the advantages and disadvantages are yet to be fully identified. This paper makes use of a non-linear loudspeaker model to analyze loudspeakers with distinct non-linear characteristics under voltage and current drive. A multi tone test signal is used in the evaluation of the driving schemes since it resembles audio signals to a higher degree than the signals used in total harmonic distortion and intermodulation distortion test methods. It is found that current drive is superior over voltage drive in a 5" woofer where a copper ring in the pole piece has not been implemented to compensate for eddy currents. However the drive method seems to be irrelevant for a 5" woofer where the compliance, force factor as well as the voice coil inductance has been optimized for linearity.
Authors:
Schneider, Henrik; Agerkvist, Finn T.; Knott, Arnold; Andersen, Michael A. E.
Affiliation:
Technical University of Denmark, Kgs. Lyngby, Denmark
AES Convention:
138 (May 2015)
Paper Number:
9292
Publication Date:
May 6, 2015
Subject:
Transducers
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