2144 Low-Pass Filter (LPF)


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Four-Pole 24dB/Octave LPF with SSI2144 architecture

The 2144 Low-Pass Filter features the SSI2144 IC, the official and improved reissue of the legendary SSM2044 filter IC used in many classic synthesizers.

With its unmistakably silky-smooth top-end and liquid-like mid-range; it is widely regarded as being one of the best sounding filters ever made. Wavefonix’s 2144 is a good addition to any Eurorack system, adding that classic buttery smooth sound, with bubbling mids. With two FM and one V/Oct input, plus CV control over resonance, 2144 is lushly equipped to definitely change/improve your sounds. A wide range of modulation possibilities also adds versatility.


  • Four-pole 24dB/octave low-pass filter.
  • Manually controllable resonance and cutoff frequency.
  • Frequency range greater than audio range (> 20Hz to 20kHz).
  • Capable of self-oscillation i.e. producing a sine wave output.
  • Thermally compensated 1V/octave input.
  • Numerous modulation possibilities including FM and resonance CV inputs (0V to 10V input range).
  • Ergonomic design.
  • Hand-built and tested in the UK.


  • Model number: W121
  • Format: Eurorack
  • Width: 10HP
  • Depth: approx. 40mm
  • Power consumption: +12V: 30mA, -12V: 30mA, +5V: 0mA


Additional information


Black, Silver