A-121-3 12dB Multimode Filter

12 dB multimode filter

Doepfer · 4 HP · 3U

Panel · 20.3 × 128.5 mm

Description

Doepfer's 12 dB multimode filter in 4 HP, the A-121-2's filter with small knobs: low-pass, high-pass, band-pass and notch outputs at once, resonance up to self-oscillation, and voltage control of the resonance.

Key features

  • Four simultaneous outputs: LP, HP, BP and N (notch), -12 dB per octave
  • Frequ sets the cut-off, about 10 Hz to 20 kHz; CV1 about 1 V/octave, CV2 through its FCV2 attenuator
  • Q sets the resonance, up to self-oscillation (a sine oscillator with no input); CQ controls it, no attenuator
  • Level sets the input level; past about 5 the filter distorts with typical A-100 levels

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