Two simple Zobel impedance compensation networks for the lossy voice-coil inductance of a loudspeaker driver are described. Design equations for the element values are given, and a numerical example is presented. The synthesis procedure can be extended to realize general RC networks which exhibit an impedance that decreases with frequency at a rate of -n dec/dec, where 0 < n < 1.
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https://aes2.org/publications/elibrary-page/?id=12997
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