Abstract
The invention provides an equalizing circuit for a loudspeaker system. The circuit includes an output amplifier connected to the circuit output, and a feedback amplifier connected to the circuit input. A plurality of filter elements are connected in series to the output of the feedback amplifier and the outputs of each of the filter elements are connected to inputs of both the output amplifier and the feedback amplifier, the amplifier inputs defining scaling factors for achieving a desired target response function for the loudspeaker system. The circuit generates a circuit transfer function having a numerator and a denominator. The numerator defines sufficient zeroes for cancelling all poles of the known transfer function of the loudspeaker system. As a result, when the circuit is connected in cascade to the loudspeaker system, the desired response function can be obtained.
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