Best Filter Modules Under $300 2026
Alright, so you're diving into the modular world but your bank account isn't thrilled about spending a fortune on filters. Totally get it. A good filter is the heart of a lot of sounds - that creamy low-pass, a gritty resonance sweep, or a surgical high-pass to clean up the mud. We're focusing on modules under $300 that actually deliver usable tone, not just cheap components and compromised design.
Last updated: April 11, 2026
⚡ The best filter modules in 2026 are Doepfer A-121s VE (top pick), ADDAC 607 Crossover for tighter budgets, and Doepfer A-121d for pros — selected from 15 options across 9 brands, priced $58–$284, ranked by brand, price and popularity.
#1
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3.2/5
AudioFu Score
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6/10
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5/10
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7/10
Doepfer A-121s VE
by
Doepfer
Frequency Control
Tonal Character
Classic Synthesis
Key Feature:
The A-121s VE is a fantastic choice for anyone craving that classic, warm Moog-inspired filter sound in a Eurorack format. It's particularly well-suited for ambient, experimental, or retro-tinged electronic music where a touch of vintage character is essential. This is a workhorse module for serious modular explorers.
PROS
- • Vintage voicing delivers warm, organic tones ideal for classic synth sounds.
- • Stereo operation expands sonic possibilities, creating rich, evolving textures.
- • Delta F control offers unique filter interaction, pushing beyond standard VCFs.
- • Robust Doepfer build quality ensures long-term reliability and stability.
CONS
- • Limited filter modes compared to some modern, more flexible designs.
- • 100mA power draw per rail can strain smaller Eurorack power supplies.
- • Black front panel, while aesthetically pleasing, shows fingerprints easily.
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3.2/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
7/10
Art. 551514
$285
#2
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3.1/5
AudioFu Score
Specs:
6/10
Detail:
6/10
Value:
9/10
ADDAC 607 Crossover
by
ADDAC
Subtractive Synthesis
Audio Processing
Frequency Control
Key Feature:
The ADDAC 607 Crossover is a surprisingly versatile little module for refining your sound. It's perfect for sound designers and experimental musicians wanting precise band separation and shaping without a huge commitment. The clean filter character and compact size make it a great addition to any Eurorack system.
PROS
- • Excellent Sallen-Key filter provides a clean, musical tone.
- • Flexible crossover frequencies allow for precise frequency shaping.
- • Compact 6HP footprint maximizes valuable rack space.
- • Individual band volume controls offer nuanced tonal sculpting.
CONS
- • 6HP is quite cramped; patching can be challenging in tight racks.
- • Limited crossover frequencies might restrict advanced processing needs.
- • Analog design means potential for drift, requiring occasional calibration.
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3.1/5
AudioFu Score
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6/10
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6/10
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9/10
Art. 618345
$120
#3
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3.0/5
AudioFu Score
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6/10
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5/10
Value:
8/10
Doepfer A-121d
by
Doepfer
Tonal Character
Classic Synthesis
Sound Shaping
Key Feature:
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.
- • Integrated mixer simplifies routing and signal management.
CONS
- • 8HP footprint can be limiting in smaller Eurorack cases.
- • Filter resonance can get quite aggressive, requiring careful control.
- • Limited filter modes compared to some more modern designs.
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3.0/5
AudioFu Score
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6/10
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5/10
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8/10
Art. 596074
$175
#4
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3.0/5
AudioFu Score
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6/10
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5/10
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9/10
Behringer Multi Filter/Resonator 1047
by
Behringer
Tonal Character
Audio Processing
Classic Synthesis
Key Feature:
This Behringer 1047 is a shockingly capable filter module for the money. It delivers a genuinely aggressive resonance and a surprising range of tones, making it perfect for experimental sound design and adding grit to techno or industrial tracks – especially for those just getting into Eurorack.
PROS
- • Excellent resonance character, truly usable for screaming sounds
- • Surprisingly robust build quality for the price point
- • Four distinct filter modes offer tonal versatility
- • CV inputs allow for dynamic, expressive filter sweeps
CONS
- • Plastic knobs feel cheap and lack precise control
- • Limited HP width restricts integration in smaller racks
- • Not a substitute for a high-end Moog or Buchla filter
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3.0/5
AudioFu Score
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6/10
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5/10
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9/10
Art. 508282
$58
#5
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3.0/5
AudioFu Score
Specs:
5/10
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10/10
Value:
8/10
Doepfer A-108
by
Doepfer
Sound Shaping
Audio Processing
Frequency Control
Key Feature:
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
- • Excellent value for a filter module of this quality and character
CONS
- • Limited output stages restrict routing options slightly
- • Transistor ladder filters can be sensitive to component aging
- • Requires Eurorack format modular system for integration
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3.0/5
AudioFu Score
Specs:
5/10
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10/10
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8/10
Art. 170862
$169
#6
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3.0/5
AudioFu Score
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6/10
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5/10
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8/10
Erica Synths Black LPG
by
Erica Synths
Audio Processing
Subtractive Synthesis
Tonal Character
Key Feature:
The Black LPG is a clever little module that gives you a lot of bang for your buck. It’s perfect for sound designers and experimental musicians who want a versatile filter/VCA in a small space—the resonance overdrive is a real highlight and adds a lot of character. It’s a great starting point for modular exploration, too.
PROS
- • Unique filter/VCA hybrid design offers incredible sonic flexibility
- • Resonance overdrive adds a satisfying grit and character
- • Compact 10HP footprint maximizes space in modular setups
- • Excellent value proposition for the feature set offered
CONS
- • Limited modulation destinations compared to larger filter modules
- • Offset control can be a bit finicky to dial in precisely
- • May not offer the pristine clarity of dedicated, high-end filters
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3.0/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
8/10
Art. 509918
$208
#7
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3.0/5
AudioFu Score
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6/10
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Doepfer A-121s
by
Doepfer
Audio Processing
Classic Synthesis
Frequency Control
Key Feature:
The A-121s is a workhorse filter module, a classic for a reason. It’s a fantastic starting point for anyone diving into modular synthesis or a reliable addition to an existing system seeking a distinct, vintage-flavored filter. The stereo capabilities and Delta F control really open up creative possibilities.
PROS
- • Classic Doepfer build quality: robust, reliable, and feels immediately familiar.
- • Versatile multimode filtering: seamlessly morphs from low-pass to bandpass.
- • Delta F control adds unique movement and dynamic filtering possibilities.
- • Stereo operation expands sonic palette for wider, more immersive soundscapes.
CONS
- • Can be a power hungry module, demanding a robust power supply.
- • Limited resonance range compared to some modern filter designs.
- • The interface, while functional, is somewhat dated visually.
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3.0/5
AudioFu Score
Specs:
6/10
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5/10
Value:
7/10
Art. 551513
$274
#8
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3.0/5
AudioFu Score
Specs:
6/10
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5/10
Value:
8/10
Doepfer A-121d VE
by
Doepfer
Tonal Character
Frequency Control
Classic Synthesis
Key Feature:
The A-121d VE is a solid, workhorse filter module that nails that classic Moog-esque vibe. It's a great entry point into more complex filtering, especially for those wanting that vintage warmth and character without a ton of bells and whistles. Perfect for sound designers and experimental musicians looking for a reliable, space-saving filter pair.
PROS
- • Excellent resonance character, classic Moog-inspired sound.
- • Dual filter design allows for complex, evolving textures.
- • Compact 8HP footprint maximizes modular space efficiency.
- • Well-built, sturdy construction characteristic of Doepfer quality.
CONS
- • Limited filter modes compared to more modern, complex filter designs.
- • Normalization can be confusing for beginners to modular synthesis.
- • Input level controls lack fine-grained adjustment for subtle shaping.
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3.0/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
8/10
Art. 596076
$186
#9
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2.9/5
AudioFu Score
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6/10
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5/10
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8/10
NANO Modules ST-FONT
by
NANO Modules
Sound Shaping
Frequency Control
Classic Synthesis
Key Feature:
The ST-FONT is a seriously cool little module for adding stereo movement and character to your patches. It's perfect for sound designers and experimental musicians who want a compact, versatile filter with a bit of edge. It’s a great starting point for exploring stereo filtering without a huge investment.
PROS
- • Stereo filtering dramatically widens soundscapes, adding real depth.
- • The 'Wild' resonance mode delivers satisfying, gritty textures.
- • CV offset control offers nuanced filter modulation possibilities.
- • Compact 14HP footprint maximizes space in tight Eurorack setups.
CONS
- • The drive control can easily overload, requiring careful gain staging.
- • Limited filter modes compared to some higher-end filter modules.
- • The attenuators feel a little plasticky, not the most premium feel.
⭐
2.9/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
8/10
Art. 604124
$215
#10
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2.9/5
AudioFu Score
Specs:
6/10
Detail:
6/10
Value:
9/10
Behringer Swords
by
Behringer
Classic Synthesis
Frequency Control
Sound Shaping
Key Feature:
The Swords is a seriously impressive filter module for the price. It's a fantastic entry point into complex filter design, letting you create everything from subtle warmth to gnarly, distorted textures. Ideal for experimental musicians and those wanting a powerful, versatile filter without a premium-priced investment.
PROS
- • Dual filters offer immense sonic sculpting possibilities.
- • Infinitely variable modes provide surprisingly nuanced filter character.
- • Flexible routing options allow for complex signal chains.
- • CV inputs offer deep modulation control for expressive sound design.
CONS
- • Plastic construction feels less robust than higher-end modules.
- • 18HP footprint can be restrictive in smaller Eurorack cases.
- • Drive/wavefolder can get harsh quickly without careful attenuation.
⭐
2.9/5
AudioFu Score
Specs:
6/10
Detail:
6/10
Value:
9/10
Art. 606391
$109
#11
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2.9/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
8/10
Endorphin.es Squawk Dirty To Me Silver
by
Endorphin.es
Audio Processing
Classic Synthesis
Sound Shaping
Key Feature:
The Squawk Dirty To Me is a fantastic character module for Eurorack. It’s a surprisingly versatile stereo filter with a real edge – perfect for sound design, experimental music, or adding grit to more conventional patches. This is a great option for anyone wanting a unique sonic signature without needing to commit to a full modular system.
PROS
- • Exceptional filter character, uniquely aggressive and musical.
- • Integrated VCA streamlines patching and sound shaping.
- • Meta-CV scanning provides evolving, dynamic filter textures.
- • Compact 6U panel saves valuable rack space.
CONS
- • Limited filter type control compared to a full Grand Terminal.
- • 120mA draw can be significant for power-constrained racks.
- • Serial HP filter might be too aggressive for subtle filtering.
⭐
2.9/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
8/10
Art. 536289
$197
#12
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2.9/5
AudioFu Score
Specs:
6/10
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4/10
Value:
7/10
Befaco BF-22 Sallen Key Filter
by
Befaco
Subtractive Synthesis
Tonal Character
Audio Processing
Key Feature:
The BF-22 nails that classic MS-20 filter vibe without the full modular commitment. It's a great way to add some grit and character to your Eurorack, especially if you’re after that raw, aggressive sound, and it's an excellent entry point into more complex filter designs.
PROS
- • Authentic MS-20 filter character, surprisingly warm and musical
- • Versatile 12dB/6dB modes offer broad sonic shaping
- • Link switch creates complex, evolving filter textures
- • Solid build quality with robust pots and reliable switching
CONS
- • 17HP footprint can be limiting in smaller racks
- • Limited input gain range requires careful level matching
- • Resonance can get quite aggressive, demanding careful modulation
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2.9/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
7/10
Art. 466964
$241
#13
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2.8/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
9/10
Doepfer A-120 Vintage Edition
by
Doepfer
Classic Synthesis
Frequency Control
Tonal Character
Key Feature:
This A-120 VCF1 is a solid choice for anyone wanting that classic Moog-style filter in their modular setup. It’s a straightforward, workhorse filter that nails the vintage vibe, and it’s a great starting point for exploring filter modulation – ideal for experimental sound design or recreating classic synth tones.
PROS
- • Classic Moog filter emulation delivers a warm, resonant character.
- • Robust construction with discrete transistors for reliable performance.
- • Vintage edition offers a distinct sonic signature compared to later models.
- • Compact size integrates easily into dense modular systems.
CONS
- • Limited filter modes compared to more modern designs.
- • Vintage components may exhibit slight inconsistencies in performance.
- • The 'vintage' designation can imply slightly higher noise floor.
⭐
2.8/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
9/10
Art. 383620
$127
#14
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2.8/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
7/10
XAOC Devices Zagrzeb
by
XAOC Devices
Frequency Control
Classic Synthesis
Tonal Character
Key Feature:
The Zagrzeb is a seriously capable stereo filter for those wanting a clean, musical tone. Its state variable design and spread control create a wide, immersive soundscape – ideal for ambient, experimental, or sound design applications where precise filtering is key. It's a fantastic addition to any modular setup needing a versatile, high-quality filter.
PROS
- • Exceptional stereo imaging thanks to the spread CV input.
- • State variable design delivers clean, musical filtering.
- • Resonance fader offers nuanced control over feedback.
- • Compact 8HP footprint maximizes patching flexibility.
CONS
- • Limited modulation options beyond the included FM CV inputs.
- • Can be a bit power hungry in a densely populated modular system.
- • Zagrzeb's character isn't as overtly aggressive as some filters.
⭐
2.8/5
AudioFu Score
Specs:
6/10
Detail:
5/10
Value:
7/10
Art. 528571
$285
#15
⭐
2.8/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
8/10
Tiptop Audio Forbidden Planet Analog Filter
by
Tiptop Audio
Sound Shaping
Frequency Control
Tonal Character
Key Feature:
The Forbidden Planet nails the Synthacon’s character, offering a raw, vintage filter sound perfect for experimental sound design and gritty basses. Its compact size makes it easy to integrate into smaller modular rigs, but be prepared to dive in and really explore its possibilities – it’s not a plug-and-play experience.
PROS
- • Authentic Steiner Parker Synthacon vibe delivers unique, resonant character
- • Excellent self-oscillation capabilities for aggressive sound design
- • Compact 8 TE module fits well in most Eurorack systems
- • Flexible multi-mode operation opens creative sonic possibilities
CONS
- • Limited filter modes compared to more complex filter modules
- • Power draw could be a factor in power-constrained systems
- • Steeper learning curve for mastering all operational nuances
⭐
2.8/5
AudioFu Score
Specs:
6/10
Detail:
4/10
Value:
8/10
Art. 449219
$152
How to Choose the Best Filter Modules
1
Resonance Character
A cheap filter often has a fizzy, uncontrolled resonance that just sounds harsh. We're looking for a sweet spot - a resonance that can get gnarly without turning into digital noise. That sweet spot is critical for basses and pads.
2
Filter Slope (dB/Octave)
12dB/octave filters are common at this price point, and that's okay. But a 24dB/octave filter gives you more aggressive filtering and a steeper cutoff, which can be vital for sculpting sounds or creating sub-bass rumble. Be aware that steeper slopes can also introduce phase issues if you're not careful.
3
Drive/Saturation
Many affordable filters lack built-in drive. This means you'll need a separate distortion module to get that gritty, overdriven character. Modules with built-in drive offer more immediate gratification, though the drive circuit itself may be a bit basic.
4
Keyboard Tracking
Accurate keyboard tracking is a must if you plan on using the filter in a melodic context. Poor tracking results in a constantly shifting tone, which is distracting and unusable. This is often a compromise in cheaper modules.
5
Build Quality & Noise Floor
Let's be honest, plastic enclosures and noisy components are common. A higher noise floor means more hiss and unwanted artifacts, which can bury your signal. It's not always a dealbreaker, but it's something to be aware of.
Buying Guide
At this price point, you're making tradeoffs. Expect simpler controls, potentially a less refined sound, and maybe a slightly less robust build. Don't expect Moog-level warmth or Buchla-style complexity. Focus on modules that nail the core filter characteristic you need, and be prepared to supplement with other modules later. A well-chosen, affordable filter is still a huge step up from a stock synth's filter - it's just about knowing what to prioritize.
How This List Is Built
We don't play these instruments — we're a catalog, not a review desk, and we'd rather say so than pretend otherwise. This page ranks 15 filter modules from the Thomann catalogue, which is the largest single source of specification data in this category.
Position is computed, not curated. Four signals, in order of weight: how completely the manufacturer documents the instrument (number of published specifications), where it sits in the price range, how specific the model designation is — which filters out generic accessories — and whether a product image exists. The same inputs always produce the same order, so nothing here is shuffled to look fresh.
What this list is good for: narrowing a category down to a shortlist by spec and budget. What it isn't: a substitute for hearing an instrument. Before you buy, read hands-on reviews and, where you can, play it. Full methodology.
Frequently Asked Questions
Low-pass cuts highs, high-pass cuts lows, band-pass lets a narrow range of frequencies through, and notch cuts a narrow range. Each has its own vibe and application - low-pass is classic for warmth, high-pass for clarity, band-pass for unique textures.
Most likely, yes. These are generally designed to be Eurorack format. Just make sure your power supply has enough headroom to handle the module's power draw.
Not at all! It's a perfectly valid filter slope. It just won't give you the extreme cutoff characteristics of a 24dB/octave. It's often smoother and more musical, too.
Some noise is unavoidable, especially with cheaper modules. But excessive noise indicates a problem - either a noisy power supply or a poorly designed filter circuit. Try different power rails to see if it helps.
No. Moog filters are legendary for a reason, and that quality comes at a cost. You can get inspired by Moog filters, but don't expect a direct clone. Look for filters that emphasize a warm, resonant low-pass character.
