When recreating music as low as 20 Hz, this circuit is used on the audio system channel output, which is synthesized by the electronic signal generator. The active crossover network drive is connected to a subwoofer (woofer) in a bridged center configuration to handle sounds below the normal sound gun range. The cross-route bridge contains a third-order Butterworth network (18 decibels per octave) that provides a 20 Hz cutoff and a 100 Hz crossover. The bass response is extended by an octave on the basis of the cross.
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