X212 - Electronic Crossover 2-way 12db


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X212 is an electronic crossover providing high-pass and low-pass outputs with 12db/octave slopes.

  • 2-way crossover
  • 12db/octave slopes
  • optimal phase resposne for hifi audio
  • Riley-Linkwitz alignment or conventional
  • can be set for any crossover frequency
  • can be set for asymmetric frequencies
  • input can be split to use filters independently
  • uses standard dual opamp - 5532, 4562, TL072, or similar
  • board size 2.4x2" 61x51mm

X212 is designed to split the audio range into smaller portions for bi-amplified systems, where one might have separate bass and treble amps, or for a subwoofer and satelite system. Cascade two X212s for a three-way system.

X212 operates from regulated supplies of +/-12V to +/-18V.

X212 FREE (227KB) includes enough material for the home hobbyist to make his own printed circuit board. The download includes the following PDFs:

  • schematic
  • parts overlay
  • top foil
  • bottom foil
  • bill of materials

Click HERE to download X212 FREE.

X212 COMPLETE (586KB) includes all of the above info, plus extensive notes detailing how the filter works and how to set the frequency, how to design for Riley-Linkwitz alignment or for conventional; how to use two X212s to make a 3-way crossover, includes gerber and excellon files for manufacturing a PCB, supply requirements. X212 COMPLETE includes:

  • schematic
  • parts overlay
  • top foil
  • bottom foil
  • comprehensive notes - 4 pages
  • gerber and excellon files
  • safety notes

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

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PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA