Doepfer A-121-2
Professional music gear - detailed information and where to buy
Doepfer
A-121-2
Product Info
* Prices may vary. Check retailer for current pricing and availability.
The A-121-2 is a quintessential Doepfer filter – a workhorse for classic synth sounds. It's a great entry point into multi-mode filtering for those building a Eurorack, especially if you appreciate that vintage Moog-esque character and need a reliable, versatile filter module.
Product Description
- Doepfer A-121-2
- 12 dB multi-mode filter
- Eurorack module
- Voltage-controlled multi-mode filter with a slope of -12 dB / octave
- 4 filter outputs with different filter characteristics available at the same time: lowpass
- bandpass
- highpass and bandstop (notch)
- Cut-off frequency (corner frequency) determines the point at which the respective filter effect occurs
- Resonance (Emphasis) Q can be set manually and via control voltage (voltage-controllable resonance)
- Width: 8 TE / 8 HP / 40.3 mm
- Depth: 50 mm
- Power requirement: +40 mA (+12 V) / -40 mA (-12 V)
PROS
- • Classic Doepfer sound – warm, musical, and instantly recognizable
- • Four simultaneous filter outputs offer incredible tonal flexibility
- • Voltage-controlled resonance adds expressive movement and character
- • Solid build quality; reliable for years of modular patching
CONS
- • Can be power hungry, requiring a robust power supply
- • 8HP footprint can be restrictive in smaller modular systems
- • Filter character leans towards vintage, might not suit modern, pristine sounds
Product Video
Key Features
Filter Type
Multi-mode (Lowpass, Bandpass, Highpass, Bandstop)
Modes
Four simultaneous outputs – Lowpass, Bandpass, Highpass, Bandstop
HP Width
8 HP
Depth
50 mm
Power Draw
+40 mA / -40 mA
CV Inputs
Cutoff Frequency, Resonance
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Frequently Asked Questions
It’s fairly linear and predictable, but with a gentle softening at higher resonance values – typical of Doepfer’s design philosophy.
It’s surprisingly versatile; you can dial in subtle, warm tones or aggressive, resonant sweeps depending on your settings and modulation.
You'll want a power supply capable of delivering at least 1A at +12V and 1A at -12V to comfortably accommodate the A-121-2 and other modules.
