LA67 – MACA Filter – Full DIY Kit

£79.00 (Excl. VAT)

4-pole multimode filter based on the SSI2140

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SKU: Kit_LA67_MACA_Filter Categories: , , Brand: HP Size: 6 HP


The MACA filter is a 4-pole multimode filter based on the SSI2140 integrated circuit. The design is essentially an updated version of the classic SSM2040 (as found in some classic synths eg: Prophet 5 Rev1 & 2, Octave Cat, RSF Kobol)

The new SSI2140 adds better temperature compensation and a VCA that helps eliminate low frequency damping at high resonance settings. Besides the obligatory 4-pole low pass, MACA adds both 2-pole low pass and 4-pole band pass outputs. There is also an input level control that allows for overdriving the filter core.

MACA Filter – Build Document


  • 4-pole LP, 2-pole LP, & 4-pole BP outputs
  • Input level control
  • 16hz-16khz range
  • “Q” CV input
  • Inverting attenuator on “FM” input
  • “V/oct” CV input
  • Sine wave oscillator at high “Q” settings


  • 6hp
  • 20mm depth
  • Current draw: 25mA/25mA  +12v/-12v
  • Reverse power polarity protection

Additional information

Weight 0.074 kg
HP Size

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