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: September 4, 2026
Stylophone CPM DF-8
- • Eight distinct filter shapes per channel for complex tones
- • Self-oscillation lets filters play melodies without keys
- • High resonance adds punch to every filter type
- • Two independent filter channels create rich textures
- • Requires separate DS-2 keyboard to be fully used
- • No specific power draw data listed in text
- • Limited to LP mode for the single 24 dB/oct filter
XAOC Devices Katowice
- • Exceptional stereo separation creates wide, immersive soundscapes.
- • Mid-band CV control offers incredibly precise tonal shaping.
- • Flexible frequency range delivers everything from subtle warmth to aggressive edge.
- • XAOC's build quality ensures rock-solid stability and long-term reliability.
- • 10HP footprint can be restrictive in smaller modular systems.
- • Limited filtering modes compared to more complex multi-mode filters.
- • Requires careful gain staging to avoid unwanted clipping at higher levels.
Doepfer A-121s
- • 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.
- • 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.
Tobinski Dual LPG/VCA
- • Excellent dual-channel design maximizes patch flexibility.
- • Model-D VCA emulation delivers authentic, warm saturation.
- • Compact 6HP footprint saves valuable rack space.
- • Fader provides intuitive, hands-on control over key parameters.
- • Limited routing options compared to more complex filter modules.
- • Power draw, while manageable, could be a concern in smaller systems.
- • The 'Combination' LPG mode can sound muddy in some applications.
Shakmat Modular Dual Dagger
- • Excellent filter character; creamy low-pass, crisp high-pass.
- • Stereo operation significantly expands sonic possibilities.
- • Compact 6HP footprint maximizes rack space efficiency.
- • Well-executed resonance control offers subtle to aggressive textures.
- • Limited modulation destinations compared to larger filter modules.
- • 90mA -12V draw is a bit higher, demanding power.
- • Bandpass mode lacks the finesse of dedicated bandpass filters.
ADDAC 604 Dual Filter
- • Warm, analog tone with a distinct vintage character
- • Stereo operation expands sonic possibilities significantly
- • Compact 6HP footprint maximizes rack space efficiency
- • Cutoff CV input offers excellent modulation control
- • Limited resonance range compared to higher-end filters
- • Build quality is adequate, but lacks premium component feel
- • Filter modes, while useful, aren’t exceptionally unique
Befaco BF-22 Sallen Key Filter
- • 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
- • 17HP footprint can be limiting in smaller racks
- • Limited input gain range requires careful level matching
- • Resonance can get quite aggressive, demanding careful modulation
Doepfer A-105-4 Quad Poly VCF
- • Excellent resonance character, classic Moog-inspired tone
- • Four filters offer immense flexibility for complex textures
- • Common controls simplify complex modulation routing
- • Robust Doepfer build quality, reliable Eurorack integration
- • 8HP footprint can be restrictive in smaller racks
- • Limited filter modes compared to some modern alternatives
- • Can be power-hungry, especially in larger systems
Joranalogue Audio Design Flow 3
- • Built-in envelope follower reacts to audio input instantly
- • Offers three distinct filter modes for sound shaping
- • Adjustable decay time from 100 milliseconds to three seconds
- • Six standard Eurorack width fits tight cases easily
- • No digital or software interface for programming
- • Limited to three output filter types only
- • Single power rail requirement limits external power options
Make Noise DXG
- • Exceptional gate response, offering nuanced rhythmic possibilities.
- • Stereo architecture allows for complex, evolving textures.
- • The normalized input simplifies mono signal routing elegantly.
- • Build quality reflects Make Noise's signature robust, tactile design.
- • Power draw is relatively high, impacting modular power budget.
- • Limited modulation options beyond the CV attenuator.
- • The direct output on channel 2 can be a little noisy.
Erica Synths Drum Stereo DJ VCF
- • Unique crossfade creates evolving, dynamic filter sweeps.
- • Stereo operation expands sonic possibilities for textures.
- • Solid build quality; Erica Synths consistently reliable.
- • Resonance control adds character and screaming potential.
- • 8HP footprint can be restrictive in smaller modular systems.
- • Limited filter modes compared to some more complex offerings.
- • Power draw is moderate; consider PSU capacity.
Erica Synths Black Polivoks VCF V2
- • Authentic Polivoks character with original K140UD12 chips
- • BP mode delivers aggressive, resonant sweeps and textures
- • Compact 10HP footprint ideal for space-constrained modular systems
- • Simple, direct controls allow for immediate sonic exploration
- • Limited filter modes compared to more versatile options
- • Can be quite aggressive and noisy at higher resonance settings
- • No attenuators on CV inputs; signal levels require careful management
NANO Modules ST-FONT
- • 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.
- • 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.
Tiptop Audio Resonator
- • Three independent filters let you shape sound in real time.
- • Switchable low, band, and high pass modes give huge flexibility.
- • CV control lets you automate frequency and resonance easily.
- • Built on the classic Moog Polymoog circuit design.
- • No specific filter slope values are listed in the text.
- • Only mono input and output channels are available.
- • Limited to a single power supply voltage range.
Befaco Pony VCF
- • Excellent low-pass character with a warm, vintage vibe
- • Integrated VCA simplifies patching and signal flow
- • Normalised feedback loop on channel 3 enables creative experimentation
- • Compact 6HP footprint maximizes space in tight Eurorack cases
- • Limited filter modes compared to more complex VCFs
- • Power draw could be a concern for systems with limited headroom
- • The mixer’s level display is basic and lacks precision
Every filter modules that matches
68 models match this page. The 15 above are covered in detail; the rest are listed here with their published specifications.
Filter Modules by the numbers
Measured across all 68 models in this category, so «wide», «short» or «expensive» mean something you can check.
How to Choose the Best Filter Modules
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.
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.
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.
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.
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 covers 68 filter modules from the Thomann catalogue, which is the largest single source of specification data in this category: 15 in detail, the rest listed with their specifications.
Position is computed, not curated. We parse the manufacturer's own description into actual values — nut width, scale, fret count, fingerboard radius, size, alloy — and rank on them: how many specifications a model has published, how many of them are measurable numbers, and how precisely it meets this page's criterion. A product image adds a little. Price is not a ranking signal: it tells you nothing about whether a neck fits your hand. 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.
