Doepfer A-105-4 Quad Poly VCF main image

Doepfer A-105-4 Quad Poly VCF

$212.00 to $305.00 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 June 17, 2026.

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Price

$305.00

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4.8 (5)

$214.00 $212.00 $2.00 · All time low

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Average Price: $259

Standard/Professional

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-105-4 Quad Poly VCF 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

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Based on price data from 2 merchants for "Doepfer A-105-4 Quad Poly VCF". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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Unleash the full potential of your modular synth with the Doepfer A-105-4 Quad Poly VCF, a powerhouse of polyphonic filtering designed for both seasoned synth enthusiasts and adventurous newcomers. This Eurorack module is built around the SSM2044 lowpass filter, celebrated for its iconic warm and smooth sound. With four independent 24dB low-pass filters at your fingertips, creativity has no limits.

Seamlessly integrate this module into your setup with a user-friendly interface offering common controls for filter frequency, modulation, resonance, and input level. Precision is a breeze with both knobs and CV inputs, each equipped with their own attenuation pots, allowing for intricate modulation possibilities. Each channel offers its own FM input, providing expansive avenues for tonal exploration.

Whether you're crafting lush, polyphonic textures or diving into the depths of intricate soundscapes, the A-105-4 delivers unmatched versatility in a compact 8HP design. Dive deep into the realm of sound design and bring your synthesis dreams to life.

Key Features:

4-channel polyphonic lowpass filter Eurorack module
Based on the revered SSM2044 lowpass filter
Universal parameters: frequency, frequency modulation, resonance (Q), and level
Control via knobs or CV inputs with individual attenuation pots
Dedicated FM input for each channel
Current consumption: 70mA (+12V) / 70mA (-12V)
Compact design with a width of 8 HP and depth of 50 mm

Product specs

Type	Lowpass Filter Eurorack Module
Depth	1.96" (50mm)
HP Size	8HP
Power Usage	±12V DC 70mA
Power Supply	Requires Eurorack case and power supply

FAQs

What type of filter is the Doepfer A-105-4 Quad Poly VCF?: The Doepfer A-105-4 Quad Poly VCF is a lowpass filter Eurorack module designed for modular synthesizer setups.
How many filter channels does the Doepfer A-105-4 have?: The Doepfer A-105-4 features four filter channels, making it suitable for polyphonic filtering applications in modular synth setups.
What is the power consumption of the Doepfer A-105-4 Quad Poly VCF?: The Doepfer A-105-4 Quad Poly VCF requires ±12V DC and consumes 70mA, so ensure your Eurorack power supply can accommodate this.
How much rack space does the Doepfer A-105-4 Quad Poly VCF require?: The Doepfer A-105-4 requires 8HP of rack space, which is a compact size for a quad polyphonic filter module.
Can the Doepfer A-105-4 Quad Poly VCF be used in any Eurorack case?: Yes, the Doepfer A-105-4 is compatible with any Eurorack case that provides the necessary power supply of ±12V DC.

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-105-4 Quad Poly VCF.

Features and functionality

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The Doepfer A-105-4 offers four identical 24dB low-pass filters based on the SSM-2044/SSI2144 design, ideal for polyphonic setups and stereo applications.
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The Doepfer A-105-4 can be cumbersome for real-time adjustments due to the need to tweak multiple filters simultaneously for a polyphonic setup.
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User experience

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Several users appreciate the module's CV inputs with attenuators and the CVFM input, which allows envelope control without extra VCAs.
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Owners recommend using 6-inch braided cables from Modular Addict for patching due to the large number of connections needed.
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The complexity of managing numerous modules for polyphony can lead to tedious patching and adjustments, discouraging some from pursuing a full Eurorack polyphonic setup.
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Comparisons

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Users note the A-105-4's sound is not identical to Korg MS-20 filters but still favorable; requires mixers for extensive CV input setups.
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Compared to modules like the Behringer 121, the A-105-4 lacks multiple CV inputs per channel, necessitating additional mixers for complex modulation setups.
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The Doepfer A-105-4 is suggested alongside AI Synthesis's 3340 VCO for better pitch stability compared to Doepfer's own VCOs.
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For those seeking polyphony in modular setups, the Harmonaig and Saich combination is recommended as a less complex and more space-efficient alternative.
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It's noted that a fully functional polyphonic setup in Eurorack might cost as much as a high-end polysynth, with less convenience in operation.
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Use cases and applications

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It's favored for both polyphonic and monophonic patches, with some users integrating it with Doepfer's poly ADSR and external VCOs for a complete synth voice.
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The A-171-4 is a four-channel polyphonic slew limiter, useful for achieving polyphonic portamento effects.
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Some users recommend integrating base polysynth modules like Polycinematic and adding Eurorack components for effects to achieve a customized setup.
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Setup and maintenance

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The Doepfer quad ADSR, A-141-4, is noted for simplifying polyphonic setups by controlling all channels uniformly with one set of ADSR knobs.
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