AudioFuAudioFu Chart · October 2026
Best Filter Modules Under $50 2026
The top pick is Behringer 904B Voltage Controlled High Pass Filter Eurorack… ($31). Behringer 121 Dual VCF Eurorack Synthesizer Module leads the high end. Ranked by the AudioFu Index from 5 models, prices checked every night.
Last updated: October 15, 2026
Top 5
Full detail for the 5 highest AudioFu Index scores. Every other model is listed below.
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Behringer 904B Voltage Controlled High Pass Filter Eurorack…
904B VC High Pass Filter · Behringer
7 for sale on Reverb1 finish at Thomann
This filter is great if you need a compact, cheap way to cut low frequencies in your rack. You can automate the cutoff with three CV inputs, and the two frequency ranges give you quick options. It works well as a simple tool, but the lack of gain and resonance controls means you won't get deep sound shaping. Perfect for beginners or those who just need to remove bass.
Pros
- Two distinct frequency ranges let you shape tone quickly.
- Compact 8 HP width fits tight modular cases perfectly.
- Three CV inputs let you automate the cutoff smoothly.
Cons
- Single high-pass mode lacks low-pass flexibility for full control.
- No gain or resonance knobs limit shaping the filter voice.
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Behringer 121 Dual VCF Eurorack Synthesizer Module
121 Dual VCF · Behringer
5 for sale on Reverb1 finish at Thomann
This Behringer 121 Dual VCF is a seriously cool way to get that vintage inSystem vibe in your modular system. It's a fantastic value for anyone wanting a warm, characterful filter sound, especially if you’re into experimental sound design or recreating classic synth tones – it's a real workhorse for the budget-conscious modular enthusiast.
Pros
- Authentic inSystem 100Min recreation delivers a classic, warm filter tone
- Dual filter design enables complex, evolving soundscapes and parallel processing
- Flexible 3-mode HP filter adds significant tonal shaping options
Cons
- Plastic housing feels noticeably less robust than higher-end Eurorack modules
- Limited HP modes compared to more versatile filter designs
59AudioFu
Index↓ 4.5%since Aug 14 · lowest so far$49 · Aug 14$47 now$47€42 at Thomann · in stockCheck price ↗ -
Behringer 1006 FiltAmp 4-Pole VCF / VCA Eurorack Module
Filtamp Module 1006 · Behringer
3 for sale on Reverb1 finish at Thomann
The Filtamp 1006 is a surprisingly capable little module. It delivers a warm, classic filter tone and the built-in VCA makes it a complete sound source. This is a fantastic entry point for beginners exploring modular synthesis, or a budget-friendly utility for experienced users.
Pros
- Excellent 24dB filter character, reminiscent of classic Moog designs
- Integrated VCA provides a complete voice-like functionality
- Affordable price point opens modular synthesis to more users
Cons
- Plastic construction feels less robust than higher-end modules
- Limited filter modes restrict sonic versatility compared to pricier options
58AudioFu
Index↓ 33.9%since Aug 14 · lowest so far$66 · Aug 14$44 now$44€39 at Thomann · in stockCheck price ↗ -
Behringer 904A Voltage Controlled Low Pass Filter Eurorack…
904A VC Low Pass Filter · Behringer
3 for sale on Reverb1 finish at Thomann
This Behringer 904A nails that classic Moog ladder filter vibe, offering a surprisingly rich and expressive sound for the price. It's an absolute steal for experimental electronic musicians, modular beginners, or anyone wanting a seriously characterful low-pass filter without emptying their wallet. The resonance is particularly fun to play with.
Pros
- Classic Moog-inspired tone at a fraction of the cost
- Versatile resonance sweeps create pronounced, musical filtering
- Three frequency ranges offer broad sonic sculpting possibilities
Cons
- Plastic construction feels less robust than higher-end filter modules
- Limited input headroom can cause distortion with strong signals
51AudioFu
Index↓ 3.4%since Aug 14 · lowest so far$32 · Aug 14$31 now$31€28 at Thomann · in stockCheck price ↗ -
The Behringer Surges is a surprisingly capable filter module for the price, clearly inspired by Mutable Instruments' Ripples. Its sound is warm and musical, perfect for adding character to evolving textures or creating resonant sweeps – a real boon for experimental electronic music producers and those exploring modular synthesis on a budget.
Pros
- Excellent filter character, recalling classic Japanese synths
- Remarkable value, especially considering Ripples inspiration
- Flexible slope switch (12/24dB) offers tonal versatility
Cons
- 8HP footprint can be limiting in smaller modular systems
- Analogue circuit might exhibit slight drift over extended use
50AudioFu
Index↓ 20.0%since Aug 14 · lowest so far$50 · Aug 14$40 now$40€36 at Thomann · in stockCheck price ↗
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 5 filter modules from the Thomann catalogue. 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
What should I look for when buying filter modules?
Key factors include build quality, sound characteristics, playability, brand reputation, warranty coverage, and value for money. Consider your musical style, skill level, and intended use to find the best match.
How much should I spend on filter modules?
Budget depends on your needs and experience level. Beginners can find quality options for $200-500, intermediate players should consider $500-1500 range, while professionals often invest $1500+ for premium features.
Are expensive filter modules worth the investment?
Higher-priced filter modules typically offer better materials, craftsmanship, and performance. They're worth it if you're serious about music, perform regularly, or need professional-grade features.
What are the best brands for filter modules?
Top brands combine quality, innovation, and reliability. We evaluate brands based on build quality, sound performance, durability, and customer satisfaction to recommend the best options for different budgets.
Should I buy filter modules online or in-store?
Both have advantages. Online offers better prices and selection, while stores allow hands-on testing. We recommend researching online first, then testing in stores if possible. Many online retailers offer excellent return policies.
