Doepfer A-128 Fixed Filter Bank main image

Doepfer A-128 Fixed Filter Bank

$172.00 to $211.93 Price Tier: Standard

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Page last updated Jul 04, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated July 4, 2026.

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Price

$211.93 4 available New

$159.00 3 available Used

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4.9 (21)

$172.00

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Average Price: $181

Standard/Professional

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-128 Fixed Filter Bank is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Standard

High-end

Price History

Based on price data from 1 merchant for "Doepfer A-128 Fixed Filter Bank". Prices shown reflect NEW condition. Tracking began Apr 25, 2026.

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Description

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Discover the Doepfer A-128 Fixed Filter Bank, an essential addition to your modular synthesizer setup that offers unparalleled sound sculpting precision. This powerful module features 15 parallel bandpass filters, each equipped with its own amplitude controller, allowing you to fine-tune each frequency band to craft your perfect soundscape. Whether you're diving into experimental sound design or refining a mix, the A-128 gives you the control to enhance or isolate specific frequencies with ease.

Designed for versatility, the Doepfer A-128 can transform raw audio into rich, complex textures. Its intuitive layout and robust build ensure that it seamlessly integrates into any Eurorack system, providing you with both reliability and creativity at your fingertips. The module fits comfortably within a 20 HP space, making it a space-efficient choice for any rack setup. With a depth of just 60 mm, this compact unit is perfect for both portable and stationary rigs.

Join the community of musicians and sound designers who trust Doepfer for their modular needs. The A-128 is more than just a tool; it's an invitation to explore new sonic territories. Whether you're a seasoned synth enthusiast or a newcomer to the world of modular synthesis, the A-128 Fixed Filter Bank is a versatile component that will elevate your music production to new heights.

Key Features:

15 parallel bandpass filters
Individual amplitude control for each filter
Width: 20 HP
Depth: 60 mm
Power requirements: +20 mA (+12 V) / -20 mA (-12 V)

Product specs

Available since	June 2007
Width	20 TE / HP

FAQs

What is the primary function of the Doepfer A-128 Fixed Filter Bank?: The Doepfer A-128 Fixed Filter Bank is designed to split an audio signal into 15 fixed frequency bands, allowing for precise control and shaping of the sound's frequency spectrum within a modular synthesizer setup.
How does the Doepfer A-128 integrate into a modular synthesizer system?: The Doepfer A-128 is a Eurorack module with a width of 20 HP, making it compatible with standard Eurorack cases. It can be easily integrated into a modular setup to provide detailed frequency filtering.
What are the benefits of using the Doepfer A-128 Fixed Filter Bank in sound design?: The Doepfer A-128 allows for detailed sculpting of audio by isolating and adjusting specific frequency bands, making it ideal for creating complex textures and enhancing sound design in modular synthesis.
Does the Doepfer A-128 require any special power supply in a Eurorack system?: The Doepfer A-128 operates on standard Eurorack power, requiring a +12V/-12V power supply, which is typical for most modular synthesizer systems.
Can the Doepfer A-128 be used for live performance settings?: Yes, the Doepfer A-128 is suitable for live performance, offering real-time control over the frequency spectrum of audio signals, which can add dynamic filtering effects to a live modular synth setup.

Videos

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Soundria eurorack modular

Patch Lab #01: Noone’s Filter Bank (English)

Soundria eurorack modular

"Doepfer A-128 Fixed Filter Bank" - Doepfer A-100 - A Patch A Week #31

Mike Yip music

Reviews

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PROS

Adds significant texture to soundscapes, especially with white noise and reverb
Offers a musical range unmatched by many pricier alternatives
Excellent build quality; solid knobs and durable faceplate
Acts effectively as both an EQ and a sound shaping filter
Opens new possibilities in sound design and frequency sculpting
Provides precise frequency selection for clear, refined mixes
Great value for price; competitive performance and quality

CONS

Lacks modulation inputs for enhanced control
No individual filter output taps available
Requires external VCA mods for per-band CV modulation

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-128 Fixed Filter Bank.

Features and functionality

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The ADDAC 601 offers CV control over each frequency band, adding a dynamic layer to the Doepfer A-128's fixed filter capabilities.
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Antumbra offers a compact fixed filter bank, mirroring the design common in many clones, making it a space-efficient option.
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Sherman Filterbank includes an input drive circuit, enabling distortion and character that the Doepfer A-128 lacks.
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The AJH Fixed Filter Bank is noted for each band being resonant, offering a different approach to sound shaping compared to the Doepfer A-128.
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Comparisons

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Serge Resonant EQ is noted for its resonance, comb outputs, and built-in feedback, providing an alternative flavor to the A-128's sound shaping.
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Behringer's clone of the Moog filter bank is a smaller, more affordable alternative to consider alongside the A-128.
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The Sherman Filterbank is praised for its versatility and iconic status, offering a wide range of uses compared to the Doepfer A-128.
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The Erica Synths Graphic Resonant Equalizer offers CV control over resonance, providing a dynamic alternative to the static Doepfer A-128.
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The Moog Spectravox is highlighted for its appeal, suggesting a different aesthetic and functional choice alongside the Doepfer A-128.
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Value and pricing

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The retired Make Noise FXDF can sometimes be found on Reverb for as low as $90, offering a budget-friendly choice.
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Use cases and applications

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Running audio through the Behringer K-2 or Wasp clone can achieve distortion effects on a budget, unlike the Doepfer A-128.
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User experience

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Owners acknowledge the Doepfer A-128 functions more like a multiband EQ, lacking the distortion capabilities of other filter banks.
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Users have found the global feedback on Serge EQ to be easily overwhelming, preferring more controlled options like the AJH or Behringer 914.
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The Behringer 914 is favored for its resonant bandpass filters, offering a unique sound quality that some users prefer over more complex banks.
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