The Linkwitz-Riley crossover network
is known for its homogenous
performance and constant amplitude.
The transfer is identical to that of two
2nd-order Butterworth filters in series.
The Linkwitz-Riley filter is an example
of an active crossover network
for a two-way loudspeaker system
whose crossover frequency is 1 kHz. It
can be built around one quad op amp
for a two-way of three-way speaker
system and can be converted to provide
alternative crossover frequencies
by proportional adaptation of the resistors.
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