Butterworth filters as loudspeaker frequency-dividing networks
J. Robert Ashley · Proceedings of the IEEE · 1970
The constant input impedance properties of combined high- and low-pass Butterworth filters would make them appear ideal for loudspeaker crossover networks. However, the combined signal at the output of the combined filter is not identical to the input. A modified filter system based on Butterworth polynomials is suggested and the transient and frequency response reported.