AudioFuAudioFu Chart · October 2026
Best AJH Synth Filter Modules 2026
The top pick is AJH Synth Gemini 2412 Dual SVF silver ($514). AJH Synth MiniMod VCF black gives you the most for the money at $330. Ranked by the AudioFu Index from 4 models, prices checked every night.
Last updated: October 15, 2026
Top 4
Full detail for the 4 highest AudioFu Index scores. Every other model is listed below.
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The Gemini 2412 is a seriously cool module for anyone wanting that classic Sequential Engine Music sound. It’s a fantastic way to add warmth and movement to your patches, especially if you’re into experimental sound design or recreating vintage synth tones. Really shines for ambient and cinematic soundscapes.
Pros
- Classic SEM filter sound, incredibly warm and resonant
- Dual SVF design offers unique filtering possibilities
- Silver faceplate elevates the module's aesthetic appeal
Cons
- Parallel/serial switching can be a bit fiddly in performance
- Limited modulation options beyond CV input
45AudioFu
IndexStableno change since Aug 14Aug 14$514 now$514€459 at Thomann · in stockCheck price ↗ -
The Sonic XV is a seriously cool filter module for sound designers who like a bit of grit. That diode ladder filter gives you that classic Moog-esque edge, and the built-in waveshapers let you twist it into something truly unique. It's a great option for anyone wanting a powerful, compact filter without needing a huge modular system.
Pros
- Diode ladder filter delivers a classic, aggressive resonance character.
- Integrated waveshapers add significant tonal flexibility and complexity.
- Multiple filter outputs provide versatile routing options for sound design.
Cons
- 70mA current draw can be a limiting factor in power-constrained systems.
- Waveshaper controls, while powerful, require a learning curve to master.
41AudioFu
Index↓ 2.8%since Aug 14 · lowest so far$402 · Aug 14$391 now$391€349 at Thomann · in stockCheck price ↗ -
This MiniMod VCF nails the sound of a vintage ladder filter, offering a raw, aggressive character perfect for driving basslines or adding grit to leads. The built-in mixer is a clever touch for streamlined patching, and its compact size makes it ideal for smaller modular setups where space is at a premium – a solid choice for sound designers and experimental electronic musicians.
Pros
- Authentic ladder filter sound, a truly classic tone.
- Integrated mixer simplifies routing and signal shaping.
- Multiple CV inputs allow for complex tracking and modulation.
Cons
- 24dB/octave filter can be aggressive for subtle filtering.
- Power consumption is relatively high for a filter module.
39AudioFu
IndexStableno change since Aug 14Aug 14$330 now$330€295 at Thomann · in stockCheck price ↗ -
The AJH Synth Matrix VCF is a serious contender for anyone wanting a versatile, characterful filter in their modular system. It's a fantastic way to add complex, evolving textures to your sound, particularly suited for experimental electronic music and sound design – it’s a real workhorse for patching and creative exploration.
Pros
- Exceptional filter flexibility with 16 distinct modes.
- The built-in VCA simplifies routing and signal flow.
- Solid build quality; feels robust for its size and price.
Cons
- 14HP footprint can be restrictive in smaller Eurorack cases.
- Limited modulation destinations beyond the core parameters.
39AudioFu
IndexStableno change since Aug 14Aug 14$435 now$435€389 at Thomann · in stockCheck price ↗
How to choose the best filter modules
Heritage & Design Philosophy
Ajh's founder, Alex Hoffman, started as a hardware engineer for Moog, and you can hear that influence. Their designs focus on musicality and a particular 'vintage' vibe - not necessarily a direct Moog clone, but a respectful interpretation with their own spin.
Tone Characteristics
That's the 'fat midrange honk' everyone talks about. Ajh filters tend to have a warmth and richness that cuts through a mix without being harsh. The resonance isn't brittle; it's creamy and sustaining, perfect for evolving textures and subtle movement.
Resonance Behavior
Unlike some filters that get ice-picky at high resonance, Ajh's filters maintain a surprising amount of control. You can push them hard for screaming leads, but they never become completely unmanageable - a huge benefit for live performance.
Build Quality
The build is solid. The cases are hefty, the knobs feel precise, and the jacks are robust enough for gigging. They aren't as flashy as some boutique brands, but they feel like they'll last.
Modulation Options
While not overloaded with modulation inputs, Ajh filters offer the essentials: cutoff and resonance modulation. This is intentional - they want you to focus on the core filtering character, rather than getting lost in a sea of modulation possibilities.
Buying guide
Okay, so you're diving into modular and need a filter? Don't just grab any old thing - a good filter is the heart of a patch. Ajh Synth has quietly become a go-to for serious modular heads, and for good reason. Their filters aren't about flashy features; they're about delivering a specific, character-rich tone that'll breathe life into your sounds.
Look, Ajh filters aren't the cheapest on the market, but you're paying for a specific character and a level of refinement. Don't expect a ton of bells and whistles - they're about the core filtering sound. If you're chasing ultra-modern, digital-hybrid sounds, these aren't for you.
But if you want a warm, musical filter that'll add some serious vibe to your modular, it's worth the investment.
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 (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 Ajh filters true Moog clones?
No. They're inspired by Moog's designs, but Alex Hoffman has added his own voice and refinements. They have a similar warmth, but a distinct character.
What's the best Ajh filter for bass?
The AJH 4-Pole Low Pass is a workhorse. It's got the resonance and low-end thump you need for driving basslines, but still retains that signature warmth. The 2-Pole is also excellent for more subtle bass shaping.
Can I use these filters live?
Absolutely. The controlled resonance and solid build make them gig-worthy. Just be mindful of feedback loops - that creamy resonance can get lively quickly.
Are the knobs easy to adjust during a live set?
Yes. The knobs have a good amount of travel and are easy to find by feel. It's a small thing, but it makes a difference when you're performing in a dimly lit club.
What's the power consumption like?
They're not power hogs, but they're not ultra-efficient either. Expect around 15-20mA per module, so factor that into your power budget.
