AudioFuAudioFu Chart · October 2026
Best Doepfer Filter Modules 2026
The top pick is Doepfer A-124 VCF5 Wasp Filter ($99). Doepfer A-121d leads the high end. Ranked by the AudioFu Index from 19 models, prices checked every night.
Last updated: October 15, 2026
Top 10
Full detail for the 10 highest AudioFu Index scores. Every other model is listed below.
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Doepfer A-124 VCF5 Wasp Filter
A-124 Wasp Filter SE · Doepfer
12 for sale on Reverb2 finishes at Thomann
This little Doepfer Wasp Filter SE is a fantastic way to inject some serious attitude into your modular system. It’s got that classic Wasp edge, surprisingly versatile despite its size, and the build quality is solid for a module in this price range. Perfect for experimental sound design or adding grit to percussive elements.
Pros
- Distinct Wasp character delivers aggressive, resonant filtering tones.
- Black front panel with yellow caps offers a unique, eye-catching aesthetic.
- Compact 8HP footprint makes it ideal for space-constrained modular setups.
Cons
- Limited multimode options compared to more complex filter modules.
- Power draw of +30mA might be significant in systems with limited power.
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Doepfer A-106-5 12dB SEM Type Voltage Controlled Filter
A-106-5 SEM Filter Special Ed. · Doepfer
9 for sale on Reverb2 finishes at Thomann
This A-106-5 SEM Filter Special Ed. is a fantastic way to inject that classic, creamy Sequential Circuits sound into your modular setup. It's a relatively compact module, perfect for those wanting a distinct vintage vibe without a huge commitment. Ideal for sound designers and synth enthusiasts craving that SEM warmth.
Pros
- Classic Sequential Circuits SEM filter sound in a compact Eurorack module.
- Cream-colored panel and black knobs offer a visually appealing, vintage aesthetic.
- Provides a rich, resonant, and characterful tone ideal for basslines and pads.
Cons
- Limited filter modes compared to more complex multi-mode offerings.
- 8HP footprint can be restrictive in smaller modular systems.
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The A-121d is a workhorse filter module for Eurorack systems. Its dual filter design and delta control make it ideal for creating evolving textures and complex tones – a great choice for experimental sound designers and those seeking classic, resonant filter character. It's a fantastic value and a solid foundation for any modular setup.
Pros
- Dual filters offer incredible flexibility for complex sound design.
- Delta control provides unique and evolving timbral shifts.
- Solid Doepfer build quality ensures long-term reliability.
Cons
- 8HP footprint can be limiting in smaller Eurorack cases.
- Filter resonance can get quite aggressive, requiring careful control.
63AudioFu
Index↓ 8.8%since Aug 14 · lowest so far$178 · Aug 14$162 now$162€145 at Thomann · in stockCheck price ↗ -
The A-124-2 is a classic for a reason. It’s a fantastic, compact filter module, especially if you're chasing that gritty, aggressive Wasp sound. Perfect for techno, industrial, or anyone needing a focused, characterful filter in a small footprint.
Pros
- Tight, aggressive resonance characteristic ideal for acid basslines.
- Slimline format maximizes space in dense modular setups.
- Robust Doepfer build quality; feels solid and dependable.
Cons
- Limited CV input attenuation range can be restrictive.
- 4HP width might feel cramped in some patching scenarios.
60AudioFu
Index↓ 17.4%since Aug 14 · lowest so far$129 · Aug 14$106 now$106€95 at Thomann · in stockCheck price ↗ -
The Doepfer A-120 VCF1 is a workhorse filter module delivering that classic Moog warmth. It's a fantastic entry point into modular synthesis, especially if you're after a vintage vibe and don’t need a ton of bells and whistles. Perfect for sound designers and those wanting a solid, reliable filter foundation.
Pros
- Classic Moog-inspired filter sound, instantly recognizable and warm.
- Robust construction with reliable, discrete transistor circuitry.
- Excellent resonance control, capable of self-oscillation for unique tones.
Cons
- Limited filter modes compared to more modern designs.
- Can be noisy at higher resonance settings – typical of older designs.
59AudioFu
IndexStableno change since Aug 14Aug 14$129 now$129€115 at Thomann · in stockCheck price ↗ -
The A-101-1 is a fantastic entry point into classic Steiner filter territory. Those vactrols really impart a creamy, organic character that's hard to replicate – it’s a go-to for ambient, experimental, and vintage synth sounds. Perfect for modular explorers wanting a core filter voice without a huge investment.
Pros
- Vactrols deliver a uniquely smooth, resonant filter response
- Classic Steiner filter design provides a warm, vintage character
- Compact 16HP footprint suits smaller modular systems
Cons
- Limited filter modes compared to more modern designs
- Power draw is relatively high for a single module
55AudioFu
Index↓ 4.1%since Aug 14 · lowest so far$162 · Aug 14$156 now$156€139 at Thomann · in stockCheck price ↗ -
This A-105-2 VE is a fantastic entry point into classic analog filter sounds. It nails that warm, resonant low-pass vibe reminiscent of vintage Moog filters, and it's remarkably affordable. Perfect for anyone wanting to add a foundational, characterful filter to their modular system without breaking the bank.
Pros
- The SSI2144 chip delivers a thick, Moog-esque resonance and warmth.
- Black front panel offers a classic, understated aesthetic for modular setups.
- Excellent value for a genuine Doepfer analog filter with this sonic character.
Cons
- Limited filter modes compared to more modern, multi-mode filters.
- The attenuators on some inputs can feel a bit coarse in their adjustment.
53AudioFu
Index↓ 4.8%since Aug 14 · lowest so far$140 · Aug 14$133 now$133€119 at Thomann · in stockCheck price ↗ -
The A-108 is a fantastic entry point into classic Moog-style filtering within a modular environment. It's a workhorse module, delivering that warm, creamy character ideal for pads, basses, and evolving textures – perfect for anyone looking to add a serious filter voice to their modular setup without a massive investment.
Pros
- Classic Moog ladder filter topology delivers warm, resonant tones
- Multiple slope options (6, 12, 24, 48dB) offer tonal flexibility
- Robust build quality characteristic of Doepfer's meticulous engineering
Cons
- Limited output stages restrict routing options slightly
- Transistor ladder filters can be sensitive to component aging
49AudioFu
IndexStableno change since Aug 14Aug 14$172 now$172€154 at Thomann · in stockCheck price ↗ -
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.
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
Cons
- Can be power hungry, requiring a robust power supply
- 8HP footprint can be restrictive in smaller modular systems
48AudioFu
IndexStableno change since Aug 14Aug 14$140 now$140€125 at Thomann · in stockCheck price ↗ -
The A-106-6 XP is a powerhouse filter for Eurorack systems, delivering that iconic Moog warmth and a surprising amount of sonic variety. It's ideal for sound designers and those seeking classic analog tones, though it demands some time to truly unlock its potential. This module is a solid choice for intermediate to advanced modular users.
Pros
- Classic Moog-inspired resonance creates thick, swirling textures
- Multiple filter modes offer surprising tonal flexibility for a Eurorack module
- Robust construction with quality Doepfer components ensures long-term reliability
Cons
- Can be power hungry, potentially impacting overall system headroom
- Steep learning curve for mastering all the filter modes effectively
48AudioFu
Index↓ 5.7%since Aug 14 · lowest so far$177 · Aug 14$167 now$167€149 at Thomann · in stockCheck price ↗
All 19 filter modules
Same index, same nightly prices — compact. Colour options of one model share a row. Tap a photo to zoom.
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Doepfer A-105-4 Quad Poly VCFDoepfer46↓ 2.2%$245€219$245€219Check ↗
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Doepfer A-103 18dB Low Pass FilterDoepfer45Stable$100€89$100€89Check ↗
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Doepfer A-121-3Doepfer45Stable$110€98$110€98Check ↗
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Doepfer A-101-2 Vactrol Lowpass GateDoepfer45Stable$111€99$111€99Check ↗
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Doepfer A-123-2Doepfer45Stable$129€115$129€115Check ↗
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Doepfer A-106-1 Xtreme Filter (MS20)Doepfer45Stable$133€119$133€119Check ↗
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Doepfer A-104Doepfer45Stable$156€139$156€139Check ↗
- 18
Doepfer A-102Doepfer44↑ 1.1%$100€89$100€89Check ↗
- 19
Doepfer A-101-6 Opto VCF Opto FET Filter / PhaserA-101-6 · Doepfer42Stable$115€103$115€103Check ↗
Filter Modules by the numbers
Measured across all 101 models we track, not a sample.
Median $133 — half of all filter modules here cost less.
How to choose the best filter modules
Heritage
Doepfer practically is modular synthesis. Their A-100 series set the standard for Eurorack, and their filters are direct descendants of classic designs, meticulously recreated. That history means a lot of refinement and a deep understanding of what makes a filter sing.
Tone Characteristics
The A-100 series filters, particularly the A-100-2 and A-100-4, offer a character that's warm and creamy, but with a surprising bite when you push them. It's not a sterile, surgical tone - it's got that fat midrange honk that cuts through a mix without being harsh. They don't do 'ice-pick' harshness, more like a satisfying, vintage transistor saturation.
Resonance Behavior
Doepfer resonance isn't just a volume boost; it's a character-shaping element. It's got a natural, self-oscillating quality that's fantastic for creating those screaming leads or sub-bass drones, but it's controlled enough that it doesn't just runaway on you. It's musical resonance, not just noise.
Build Quality
These are robust modules. The panel printing is simple, maybe a little dated by today's standards, but the pots are solid, the jacks are reliable, and the internal components are well-chosen. They're built to gig - I've seen them take a beating and keep on filtering.
Compatibility
Doepfer's modules are designed to work with each other seamlessly, but they also integrate well with other brands in Eurorack. The HP/V format is a standard for a reason, and Doepfer's adherence to it ensures a smooth patching experience.
Buying guide
Alright, so you're diving into Eurorack and filters are the heart of that warm, evolving sound we all chase. Doepfer filters are legendary for a reason - they're not just filters, they're a lineage. If you're serious about crafting classic synth tones, or just want a reliable, musical filter in your modular, Doepfer's your starting point. Let's break down what makes them tick.
Don't chase the newest, flashiest filter. The older A-100 series filters (2 and 4 pole) are the sweet spot for tone and value. They're readily available used and often at reasonable prices.
Be aware that some early versions had minor component differences, but honestly, the sonic differences are subtle - focus on condition and price. These aren't going to fall apart, but treat the pots gently - they're not the smoothest you'll ever feel.
How the AudioFu Index works
Five measured signals and nothing else — no stars from strangers, no “tested by experts” we didn’t do. The weights are fixed and public. We don’t play these instruments; we measure the market around them.
This chart covers 28 filter modules from the Thomann catalogue (of 101 in the category). Before you buy, read hands-on reviews and, where you can, play it. Full methodology.
AudioFu earns a commission when you buy through our Thomann links. It never changes the order — the index does.
- Demand40%
How many of this exact model are for sale on Reverb right now — what musicians actually buy and resell.
- Lineup20%
How many finishes Thomann stocks — makers expand the models that sell.
- Price15%
Where the price has moved since we started tracking in August.
- Specs15%
How completely the maker documents it.
- Maker10%
How deep the brand’s range is in this category.
Questions
Are Doepfer filters better than Moogs?
'Better' is subjective. Moogs have a different vibe - more aggressive and precise. Doepfer filters offer a warmer, more vintage character. They excel at different things, so it depends on your sound.
What's the difference between the A-100-2 and A-100-4?
The '4' has two more resonance peaks, giving it a more complex and potentially more aggressive character. The '2' is generally considered more versatile and easier to dial in for subtle filtering.
Can I use these filters for bass?
Absolutely. The low-end thump is there, especially with resonance. Just be mindful of that midrange honk - it can clash with some bassy sounds. Experiment with cutoff and resonance to find the sweet spot.
Are Doepfer filters difficult to integrate into a modern modular system?
Not at all. They adhere to the Eurorack standard. The biggest thing is understanding their signal level - they might require some gain staging adjustments to match the levels of more modern modules.
Are there any known issues with older Doepfer modules?
Early A-100 modules sometimes used slightly different transistors which could affect the tone, but it's generally not a significant issue. Check the panel markings for version numbers if you're really concerned, but honestly, focus on overall condition.
