2 ways -24dB/Oct linkwitz-Riley crossover electrical frequency divider network for audio amplifier, It is a active X-over for two way speaker system.
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Knowledge of Linkwitz-Riley crossover/divider network
A Linkwitz-Riley (L-R) filter is an infinite impulse response filter used in Linkwitz-Riley audio crossovers, named after its inventors Siegfried Linkwitz and Russ Riley, which was originally described in Active Crossover Networks for Noncoincident Drivers in JAES Volume 24 Issue 1 pp. 2-8; February 1976. It is also known as a Butterworth squared filter. An L-R crossover consists of a parallel combination of a low-pass and a high-pass L-R filter.