AudioFuAudioFu Chart · October 2026
Best ADDAC Filter Modules 2026
The top pick is ADDAC 604 Dual Filter ($245). ADDAC 607 Crossover gives you the most for the money at $129. ADDAC 601 VC Fixed Filterbank leads the high end. Ranked by the AudioFu Index from 5 models, prices checked every night.
Last updated: October 12, 2026
Top 5
Full detail for the 5 highest AudioFu Index scores. Every other model is listed below.
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The ADDAC 604 is a surprisingly capable dual filter module that delivers a warm, classic analog sound without taking up a ton of space. It’s a fantastic entry point for those exploring filter design or needing a compact stereo filtering solution, especially those building smaller, focused systems.
Pros
- Warm, analog tone with a distinct vintage character
- Stereo operation expands sonic possibilities significantly
- Compact 6HP footprint maximizes rack space efficiency
Cons
- Limited resonance range compared to higher-end filters
- Build quality is adequate, but lacks premium component feel
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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.
Cons
- 6HP is quite cramped; patching can be challenging in tight racks.
- Limited crossover frequencies might restrict advanced processing needs.
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The ADDAC 601 VC is a seriously cool module for sound designers and experimental musicians. It's fantastic for creating unique textures and rhythmic effects – think lo-fi hip-hop, glitchy soundscapes, or adding character to synth pads. If you're looking for a unique, hands-on filtering experience without a huge investment, this is a great choice.
Pros
- Excellent analogue character, distinct and usable filter frequencies
- Individual volume and mute per band offer incredible sonic sculpting
- Envelope follower output adds dynamic movement and modulation possibilities
Cons
- Fixed filter frequencies limit versatility compared to fully sweepable filters
- 340mA current draw can strain power supplies in smaller racks
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The ADDAC 603 is a seriously powerful filter module for those diving deep into sound design. It's ideal for experimental musicians and sound sculptors who crave intricate textures and movement—the triple bandpass architecture really lets you carve out unique sonic spaces. Be prepared to spend some time learning its ins and outs, but the payoff is huge.
Pros
- Triple bandpass design offers complex, evolving timbres.
- Robust construction with quality internal components inspires confidence.
- Flexible CV routing allows for intricate modulation possibilities.
Cons
- 22HP footprint can be restrictive in smaller modular setups.
- Steep learning curve for mastering advanced modulation techniques.
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The ADDAC 605 Spectral Tilt is a seriously clever little module for adding subtle or dramatic stereo shaping to your sounds. It's fantastic for experimental sound design or adding a unique sheen to pads and textures – really shines when you want to add movement and a sense of space. Perfect for anyone looking to add some character without a huge commitment to space or budget.
Pros
- Excellent stereo image manipulation with Spectral Motion feature
- Compact 4HP footprint maximizes modular space efficiency
- Bipolar attenuator offers precise Tilt CV control
Cons
- Limited filter resonance; not a primary filtering solution
- 40mA current draw can be significant in power-constrained systems
How to choose the best filter modules
Heritage
Addac's roots are in vintage Swedish synthesizer design. They've absorbed that classic, analog ethos and refined it over years, resulting in a tone that's both familiar and uniquely their own.
Filter Topology (Typically 24dB/Octave)
Most Addac filters are 24dB/octave designs, which provides a smooth, resonant character - not the harsh, aggressive slope you sometimes find with steeper filters. This makes them incredibly versatile, from subtle low-pass warmth to screaming leads.
That "Swedish Honk"
This isn't hyperbole. Addac filters possess a distinct, almost vocal quality in their resonance. It's a fat midrange honk that cuts through a mix without sounding brittle, a quality that's fantastic for basses, pads, and even distorted leads.
Build Quality
The modules are built like tanks. The metal chassis feel substantial, the knobs are smooth and precise, and the components are generally top-notch. You're paying for that robustness - they're modules you'll be gigging with for years.
Module Size & Power Consumption
Addac modules tend to be a bit larger than some of the more compact Eurorack options, and they draw a decent amount of power. Plan your panel space and power supply accordingly; don't cram them in next to a tiny oscillator.
Buying guide
Alright, so you're diving into the rabbit hole of modular filters? Smart move. If you're serious about that Moog-esque warmth with a touch of Swedish eccentricity, you need to be looking at Addac. They've been quietly crafting some of the most characterful filters around for decades, and they're not about flashy gimmicks - just pure, musical filtering.
Addac filters aren't cheap, but you're getting a level of build quality and sonic character that justifies the price. The biggest trade-off is size - they're not tiny. Be prepared to pay a premium for that vintage-inspired sound and rock-solid construction.
Don't expect a ton of fancy features either; Addac focuses on nailing the core filtering experience.
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 102 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 Addac filters difficult to integrate into a modular system?
Not really. They're standard voltage-controlled filters with straightforward inputs and outputs. The only thing to watch is their power draw - make sure your PSU can handle it.
How do Addac filters compare to Moog filters?
They share a similar warmth, but Addac filters have that unique 'honk' that Moogs lack. Moogs tend to be a bit smoother and more predictable, while Addacs have more personality and a slightly more aggressive resonance curve.
Do Addac filters require a lot of calibration?
Generally, no. They're pretty well-behaved out of the box, but a quick voltage offset calibration can always improve tracking. It's a simple process outlined in the manual.
Are Addac modules readily available?
They're not mass-produced, so finding them can sometimes require patience. Check online marketplaces and reputable Eurorack dealers - availability fluctuates.
Can I use Addac filters for subtle effects?
Absolutely! While they shine with aggressive resonance, they're equally effective for adding subtle warmth and texture to your sounds. A little bit of low-pass filtering can do wonders for taming harsh transients.
