F-1: Stereo Lowpass Filter

Stereo Lowpass Filter with many modern touches including stereo/dual-mono operation, temperature compensation and more

Bob Moog's "transistor ladder" filter is a work of genius. This brilliant design uses a small number of components to achieve the warm and fat sound that has inspired generations of musicians. When designing our F-1: Stereo Lowpass Filter, we researched many filter topologies but ultimately came back to the elegant transistor ladder as our starting point. From there, we added modern touches like linked-stereo (or dual-mono) operation, 12/18/24dB slope/octave selection, and temperature compensation for accurate tracking.

The F1 filter can also be used in creative ways, for example as an "extreme" mono filter with 24 dB/Oct (non-resonant), 36 dB/Oct, or 48dB/Oct. Check out the User Guide to find out more!

Here's a short film on how we made our modules (includes prototypes and interesting tidbits!):


  • 70 mA +12V
  • 65 mA -12V
  • 0 mA 5V
  • 41 mm deep
  • Ø 5.00 (1 Votes) Average Rating

This Module is currently available.

$449 Price in € submitted Jul 2nd 2018, 18:28 by 11frozentreat11 | last Change Aug 14th 2018, 14:18 by StrangeSci

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