doepfer/a-105-2
A-105-2 24dB SSI Low Pass Filter
Voltage controlled 24dB/octave lowpass filter based on the SSI2144 chip (successor to the SSM2044), with two audio inputs and CV control over frequency and resonance.323
Visualization filter_response
Capabilities 3
- Lowpass Filterlowpass-filter
- 24dB/octave lowpass filter based on the SSI2144, self-oscillating, with two audio inputs and two frequency CV inputs.323
- Self-Oscillationself-oscillation
- SSI 2144-based 24 dB/oct lowpass; resonance reaches self-oscillation with V/Oct tracking.323
- Vcfvcf
- Voltage-controlled SSI 24 dB/oct lowpass filter.323
Jacks 6 — 5 in / 1 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (5) | |||
| FCV1 | cv | — | Frequency CV input 1, no attenuator, approximately 1V/octave tracking.323 |
| FCV2 | cv | — | Frequency CV input 2, with attenuator knob.323 |
| Input 1 | audio | — | Audio input 1 with level attenuator knob.323 |
| Input 2 | audio | ≤15V | Audio input 2 without attenuator. Max input voltage without clipping: about 15Vpp.323 |
| QCV | cv | — | Resonance CV input, with attenuator knob.323 |
| Outputs (1) | |||
| Out | audio | ≤15V | Filtered audio output. Max output voltage without clipping: about 15Vpp.323 |
Parameters 5
| Name | Type | Range | Behavior |
|---|---|---|---|
| FCV2 attenuator | knob | — | Attenuates the frequency control voltage applied to socket FCV2.323 |
| Frequ | knob | 15Hz – 15000Hz | Manual control of the filter cutoff frequency.323 |
| Input 1 Level | knob | — | Attenuates the audio signal applied to socket Input 1.323 |
| Q | knob | — | Manual control of the filter resonance, adjustable up to self-oscillation.323 |
| QCV attenuator | knob | — | Attenuates the resonance control voltage applied to socket QCV.323 |
Firmware history 0 versions
No firmware history recorded.
References 1
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Doepfer A-105-2 24dB SSI Low Pass Filter product pageproduct_page● verified 2026-05-14