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Average Price: $112

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$149

$350+

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Based on price data from 2 merchants for "Doepfer A-120 Low Pass Filter". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Step into the world of classic synth sounds with the Doepfer A-120 Low Pass Filter, a staple for any Eurorack modular synthesizer setup. This 24dB transistor ladder filter encapsulates the essence of the legendary Moog sound, offering a harmonic richness that defined an era of music. With its voltage-controlled design, the A-120 seamlessly filters out high-frequency components, allowing low frequencies to pass through unscathed, delivering that iconic warm and resonant audio signature.

The A-120 is not just about nostalgia; it's about flexibility. Featuring three CV inputs, this module provides ample opportunity for creative modulation — whether you're manually adjusting the cutoff frequency or experimenting with filter modulation using an LFO. Its resonance control is a standout feature, enabling the module to reach self-oscillation and function as a sine wave oscillator. This adds an additional layer of versatility, making it a dual-purpose tool in your sonic arsenal.

Compact yet powerful, the A-120’s design ensures it fits snugly into your Eurorack setup without compromising on performance. Whether you're a seasoned synth enthusiast or a newcomer to the modular scene, the Doepfer A-120 Low Pass Filter is an essential module for crafting rich, dynamic soundscapes.

Key Features:

  • 24dB transistor ladder filter for Eurorack modular synthesizers
  • Voltage-controlled low-pass filter with manual and CV modulation options
  • Adjustable resonance reaching self-oscillation for use as a sine wave generator
  • Compact size: 8HP wide, 40mm deep
  • Power usage: +30mA (+12V), -20mA (-12V)

Product specs

Type Low Pass Filter Eurorack Module
Depth 1.58" (40.3mm)
HP Size 8HP
Power Supply Requires Eurorack case and power supply

FAQs

What is the function of the Doepfer A-120 Low Pass Filter in a modular synth setup?

The Doepfer A-120 Low Pass Filter is designed to remove high frequencies above a certain cutoff point, allowing only the lower frequencies to pass through. This creates a smoother, warmer sound by filtering out the higher harmonics.

How many HP does the Doepfer A-120 Low Pass Filter require in a Eurorack setup?

The Doepfer A-120 Low Pass Filter requires 8HP of space in a Eurorack modular synthesizer case.

Is the Doepfer A-120 Low Pass Filter compatible with all Eurorack power supplies?

Yes, the Doepfer A-120 Low Pass Filter is compatible with standard Eurorack power supplies, but it requires a Eurorack case and power supply to operate.

What is the depth of the Doepfer A-120 Low Pass Filter module?

The depth of the Doepfer A-120 Low Pass Filter module is 1.58 inches (40.3mm), making it suitable for most Eurorack cases.

Raul's World of Synths

Raul's World of Synths

Doepfer A118 Filtering with A120 VCF Low Pass Filter Part One

Video thumbnail for Doepfer A118 Filtering with A120 VCF Low Pass Filter Part One by Raul's World of Synths

Doepfer A118 Filtering with A120 VCF Low Pass Filter Part One

Raul's World of Synths

Raul's World of Synths

Video thumbnail for Doepfer A-120 (Moog) Low Pass Filter Demo by @PatchPierre by Pierre Serné

Doepfer A-120 (Moog) Low Pass Filter Demo by @PatchPierre

Pierre Serné

Pierre Serné

Video thumbnail for Doepfer A118 Filtering with A120 VCF Low Pass Filter Part Two by Raul's World of Synths

Doepfer A118 Filtering with A120 VCF Low Pass Filter Part Two

Raul's World of Synths

Raul's World of Synths

Video thumbnail for Doepfer A-120 VCF1 Low Pass Filter by Let's Listen

Doepfer A-120 VCF1 Low Pass Filter

Let's Listen

Let's Listen

Reviews

PROS

  • Great sound quality

  • Affordable price

  • Emulates Moog's transistor cascade sounds well

  • Favored over other types and brands of filters

  • Compact design typical of A100 series

CONS

  • Build quality feels flimsy

  • Misleading marketing as a Moog filter

  • Sound distortion may not suit all uses

  • Requires slim fingers for comfortable knob operation

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-120 Low Pass Filter.

Features and functionality

  • The Doepfer A-120 lacks CV control of resonance, differentiating it from some other Moog-style filters.

    Source

Comparisons

  • Doepfer A-120 and A-108 are both Moog-style ladder filters, with the A-108 offering more features than the A-120.

    Source
  • Owners note the Doepfer A-120 retains more low frequencies at high resonance compared to MI Ripples, which is valued in certain sonic contexts.

    Source
  • Unlike some other Moog-style filters, the A-120 does not drop bass as drastically with increased resonance, offering a distinct advantage in bass-heavy setups.

    Source

Use cases and applications

  • The Doepfer A-120 is noted for capturing the Moog Mother-32 vibe in a Eurorack format.

    Source
  • The Doepfer A-120 is favored for maintaining bass frequencies in mixes, making it suitable for applications where low-end preservation is crucial.

    Source

User experience

  • Some users are surprised by the A-120's ability to maintain bass presence despite its Moog-style design, challenging typical expectations of ladder filters.

    Source

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Artist usage

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See how Masonna uses Doepfer A-120 Low Pass Filter

Masonna

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Verified via Photo

A Doepfer A-120 Low Pass Filter can be seen on the tray image of the Space Machine album Cosmos From Diode Ladder Filter

Genre Usage

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Used With

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