Best ADDAC Filter Modules 2026
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.
Last updated: May 13, 2026 • Next update: May 20, 2026
ADDAC 603 VC Triple Bandpass Filter
- • Triple bandpass design offers complex, evolving timbres.
- • Robust construction with quality internal components inspires confidence.
- • Flexible CV routing allows for intricate modulation possibilities.
- • Dry signal path preserves original signal for blending and layering.
- • 22HP footprint can be restrictive in smaller modular setups.
- • Steep learning curve for mastering advanced modulation techniques.
- • Lacks a dedicated resonance control for each filter stage.
ADDAC 601 VC Fixed Filterbank
- • 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
- • Compact 20HP footprint maximizes space in Eurorack systems
- • Fixed filter frequencies limit versatility compared to fully sweepable filters
- • 340mA current draw can strain power supplies in smaller racks
- • Attenuator on input 1 feels a little flimsy for frequent adjustments
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
ADDAC 605 Spectral Tilt
- • Excellent stereo image manipulation with Spectral Motion feature
- • Compact 4HP footprint maximizes modular space efficiency
- • Bipolar attenuator offers precise Tilt CV control
- • Solid build quality; feels robust for its size and price
- • Limited filter resonance; not a primary filtering solution
- • 40mA current draw can be significant in power-constrained systems
- • Spectral Tilt control range could benefit from a wider spread
ADDAC 607 Crossover
- • 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.
- • 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.
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
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.
Our Methodology
We don't just stare at spec sheets here. We've spent countless hours putting these Addac filters through the wringer: A/B'ing them against everything from Moogs to Mutable Instruments, tracking them into Ableton for mixdown, and, crucially, hauling them to band rehearsals to see how they hold up in a real-world, loud-and-dirty environment. It's about feeling the response, hearing the nuances, and knowing how these modules behave when things get hectic.
