behringer/1047
1047 Multimode Filter/Resonator
Legendary 2500 Series 12dB State Variable Filter Module for Eurorack with simultaneous lowpass, highpass, bandpass, and notch filter outputs.768
Capabilities 2
Jacks 8 — 4 in / 4 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (4) | |||
| F CV 1 | cv | -10V to 10V | Routes external CV or modulation for filter frequency; scaled at 1V/oct.768 |
| F CV 2 | cv | -10V to 10V | Routes external CV or modulation for filter frequency; scaled at 1V/oct.768 |
| INPUT | audio | — | Routes audio signals into the module. Can also accept a keyboard gate signal to ring the filter for percussive sounds.768 |
| Q CV | cv | -10V to 10V | Routes external CV for resonance (Q) control; 1V doubles the Q factor.768 |
| Outputs (4) | |||
| BP | audio | — | Band-pass filter output.768 |
| HP | audio | — | High-pass filter output.768 |
| LP | audio | — | Low-pass filter output.768 |
| NOTCH | audio | — | Notch filter output.768 |
Parameters 9
| Name | Type | Range | Behavior |
|---|---|---|---|
| COARSE | knob | 31Hz – 8000Hz | Sets the general frequency area (fc) used simultaneously for all filter types: high-pass threshold, low-pass threshold, band-pass center frequency, and notch filter center frequency.768 |
| F CV 1 Attenuator | knob | — | Adjusts the attenuation of the F CV 1 input signal, from off (-∞) to unity gain.768 |
| F CV 2 Attenuator | knob | — | Adjusts the attenuation of the F CV 2 input signal, from off (-∞) to unity gain.768 |
| FINE | knob | 0.5 – 2 | Refines and focuses the frequency set by the COARSE knob, scaling it by a factor of x1/2 to x2.768 |
| INPUT Attenuator | knob | — | Adjusts the level of the audio signal entering the module, from off (-∞) to unity gain.768 |
| NOTCH FREQ/fc | knob | -3octave – 3octave | Offsets the notch filter center frequency relative to fc. At '1' (standard position), notch is at fc. CCW shifts notch below fc; CW shifts notch above fc. At full CCW the notch output becomes a copy of the high-pass output; at full CW it becomes a copy of the low-pass output.768 |
| Q CV Attenuator | knob | — | Adjusts the attenuation of the Q CV input signal, from off (-∞) to unity gain.768 |
| RESONANCE (NORM/LIM) | switch | — | Selects between NORM (normal resonance) and LIM (limiting mode, which limits the height of the resonant peak to prevent circuit overload at high Q settings).768 |
| RESONANCE (Q) | knob | ≥0.5 | Controls filter Q (width/sharpness). Low Q gives wider, smoother curves; high Q narrows curves and produces resonant peaks. At very high Q the circuit may overload, requiring the NORM/LIM switch to be set to LIM.768 |
Firmware history 0 versions
No firmware history recorded.
References 1
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[768]
Behringer 1047 Multimode Filter/Resonator Quick Start Guide (official QSG PDF via mirror)manual● verified 2026-05-22