Doepfer A-121-3
Professional music gear - detailed information and where to buy
Doepfer
A-121-3
Product Info
* Prices may vary. Check retailer for current pricing and availability.
The A-121-3 is a workhorse filter – it delivers that classic, creamy Doepfer tone that’s instantly recognizable. It's a great entry point into modular filters, perfect for someone wanting a flexible, space-efficient, and affordable core sound-shaping tool. It won't replace a super-complex, modern filter, but it's a fantastic foundation.
Product Description
- Doepfer A-121-3
- Eurorack Module
- 12 dB multimode VCF
- Controls for filter frequency
- modulation depth
- resonance and input level
- CV inputs for filter frequency (2x) and resonance
- Outputs for low pass
- band pass
- high pass and notch
- Current consumption: 40 mA (+12 V) / 30 mA (-12 V)
- Width: 4 HP
- Depth: 50 mm
PROS
- • Classic Doepfer sound: warm, resonant, and distinctly analog
- • Versatile multimode operation expands sonic possibilities significantly
- • Compact 4HP footprint maximizes space in tight Eurorack setups
- • Solid build quality with reliable Doepfer component selection
CONS
- • Limited modulation options compared to more modern filter designs
- • Input level control can be a bit sensitive and require tweaking
- • The resonance can self-oscillate easily at higher settings
Product Video
Key Features
Filter Type
Multimode Voltage Controlled Filter (VCF)
Modes
Low Pass, Band Pass, High Pass, Notch
HP Width
4
Depth
50 mm
Power Draw
40 mA (+12V) / 30 mA (-12V)
CV Inputs
2 (Filter Frequency & Resonance)
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Frequently Asked Questions
It’s more aggressive and prone to self-oscillation than a Moog, offering a different character but still capable of rich, resonant tones.
No, it’s designed as a Eurorack module and requires a modular synthesizer system to provide power and audio/control voltage signals.
Yes, it can be a little sensitive, especially at higher input levels, so careful gain staging is recommended to avoid unwanted noise.
