Audiophilepure

https://www.monoandstereo.com/2021/01/magico-m9-full-product-info.html

At such a low frequency, a passive crossover would require huge inductors and capacitors which would incur substantial losses. The meticulous design of the MXO has fully balanced and discrete circuit topology with Linkwitz-Riley filters to deliver steep 24 dB per octave slopes at the crossover frequency of 120 Hz. Precision step attenuators provide 0.5 dB/step control of each output, using a proprietary technique to ensure purity in the signal path. Open architecture accommodates additional filter topologies. The external power supply chassis regenerates AC and applies active regulation to every part of the circuitry. 

A pair of M9 loudspeakers requires two stereo or four monaural amplifiers. The M9 tweeter, midrange and mid-bass drivers are controlled by a three-way passive crossover with acoustical target 24 dB-per-octave Linkwitz-Riley filters. Magico’s elliptical symmetry crossover design preserves maximum frequency bandwidth with minimal IM distortion.  

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