Random*Source Serge Resonant EQ
Ten-band resonant formant sculptor with feedback
14 HP Eurorack module
The Serge Resonant EQ is a ten-band equalizer designed for electronic sound synthesis, with bands spaced at major seventh intervals to produce formant peaks and valleys similar to acoustic instruments. Each band can be set to flat, boost/cut up to 12dB, or pushed into resonance for dramatic tonal sculpting. The Random*Source Eurorack adaptation adds an input mixer with two channels, a feedback path with phase inversion, and COMB outputs mixing alternating bands for comb-filter-like timbral effects.
Features
- Ten-band equalizer with bands spaced at major seventh intervals (except top and bottom bands)
- Bands can be set to flat, boost/cut up to 12dB, resonant, or deep rejection
- COMB1 output mixing alternating odd bands: 29Hz, 115Hz, 411Hz, 1.5kHz, 5.2kHz
- COMB2 output mixing alternating even bands: 61Hz, 218Hz, 777Hz, 2.8kHz, 11kHz
- Two EQ outputs (identical) mixing all ten bands
- Two inputs with individual level/gain knobs (IN1, IN2)
- Input gain resistors RG1/RG2 configurable for unity, +33%, or +47% maximum gain
- Input gain stage can distort/clip signal before entering EQ when driven hard
- Feedback section with knob controlling amount of output fed back to input
- Phase switch for normal or inverted feedback
- Inverted feedback produces phase cancellation, thinning, and level reduction
- Normal feedback increases level and can drive self-oscillation
Controls & Jacks (20)
- Band 5.2kHz — EQ band centered at 5.2 kHz - boost/cut up to 12dB or resonant mode
- Band 11kHz — EQ band centered at 11 kHz - boost/cut up to 12dB or resonant mode
- Out Left — Main equalized output - mix of all ten filter bands
- Out Right — Second identical equalized output - mix of all ten filter bands
- Band 1.5kHz — EQ band centered at 1.5 kHz - boost/cut up to 12dB or resonant mode
- Band 2.8kHz — EQ band centered at 2.8 kHz - boost/cut up to 12dB or resonant mode
- COMB 1 — Alternate filter band output: 29Hz, 115Hz, 411Hz, 1.5kHz, 5.2kHz
- COMB 2 — Alternate filter band output: 61Hz, 218Hz, 777Hz, 2.8kHz, 11kHz
- Band 411Hz — EQ band centered at 411 Hz - boost/cut up to 12dB or resonant mode
- Band 777Hz — EQ band centered at 777 Hz - boost/cut up to 12dB or resonant mode
- Phase — Sets feedback phase - normal or inverted for phase cancellation effects
- Feedback — Feedback amount control - feeds back output or inverted output signal
- Band 115Hz — EQ band centered at 115 Hz - boost/cut up to 12dB or resonant mode
- Band 218Hz — EQ band centered at 218 Hz - boost/cut up to 12dB or resonant mode
- IN 1 Input — Audio input 1 - patch audio signal here
- IN 2 Input — Audio input 2 - patch audio signal here
- Band 29Hz — EQ band centered at 29 Hz - boost/cut up to 12dB or resonant mode
- Band 61Hz — EQ band centered at 61 Hz - boost/cut up to 12dB or resonant mode
- IN 1 — Input level attenuator/amplifier for first audio input
- IN 2 — Input level attenuator/amplifier for second audio input
How-To Guides
- Vowel Formant Sculpting
- COMB Output Timbral Splitting
- Resonant Band Self-Oscillation
- Feedback Drone and Chaos
- Inverted Feedback Phase Cancellation
- Pre-EQ Input Distortion
- Dual Input Blend and Morph
- Acoustic Instrument Formant Emulation
- Percussive Resonator
- Low End Formant Bass Sculpting
Explore the interactive Serge Resonant EQ panel on BleepDex — tap any control to learn what it does.
