Thirty-six knobs, six inputs, six outputs, and a stereo matrix that doesn’t apologize for its complexity—just works.
Overview
The ADDAC814 6x6 Stereo Matrix Mixer isn’t subtle. It’s a pair of Eurorack modules—ADDAC814A (jacks) and ADDAC814B (master controls)—that together form a full 6-in by 6-out stereo matrix, taking up 33hp of rack space. When you patch it in, you’re not just adding a mixer; you’re installing a routing hub, a feedback playground, and a CV switchboard all at once. It’s the kind of module that makes you rearrange your whole system just to give it center stage. And yet, despite its density, owners report it feels intuitive—“very straightforward and stereo,” as one reviewer put it. That’s high praise in a world where matrix mixers can feel like puzzles with missing pieces.
It’s not just about audio either. The ADDAC814 is DC coupled, so it handles control voltages as easily as audio signals. That means you can route LFOs through the matrix just as cleanly as you’d send a drum bus to six different reverb returns. The jumpers on the back of both modules let you set each channel independently to Line or Synth Level, which is a quiet but critical detail—no more guessing whether your outboard gear will clip or float. And because the left input channels are normalled to the right, stereo pairing is automatic unless you override it, saving cables without sacrificing flexibility.
It’s also a module that wants you to write on it. Blank spaces on the left and bottom edges of the panel are practically begging for a Sharpie, so you can label your most-used sources and destinations. This isn’t a slick, sealed artifact—it’s a tool meant to be personalized, annotated, and lived with. The 36 color-coded knobs aren’t just for show: black for outputs A, C, E; dark red for B, D, F; and cream knobs along the diagonal (1A, 2B, etc.) to highlight potential feedback paths. It’s a visual language that pays off fast when you’re mid-performance and need to find 4D in a flash.
Specifications
| Manufacturer | ADDAC System |
| Width | 25hp + 8hp (33hp total) |
| Depth | 45mm |
| Power | +12V 140mA / -12V 140mA |
| Current Draw | 140 mA +12V, 140 mA -12V, 0 mA 5V |
| I/O configuration | 6-in x 6-out stereo matrix mixer |
| Number of inputs | 6 |
| Number of outputs | 6 |
Key Features
Color-coded for clarity, not just flair
The ADDAC814’s 36 knobs aren’t just functional—they’re a design solution to a real problem: visual overload. In a dense matrix, it’s too easy to twist the wrong knob and send a snare into a feedback loop you didn’t mean to trigger. The color scheme—black for A/C/E outputs, dark red for B/D/F, and cream for the diagonal—creates an instant map. The cream knobs (1A, 2B, 3C, etc.) are especially clever, drawing attention to the self-feedback paths that are often the most musically interesting. It’s a small touch, but one that turns a tangle of cables into a navigable space.
Expandable by design
While the base 6x6 setup is powerful, the system is built to grow. Using additional modules like the ADDAC814A and ADDAC814C, you can expand to configurations like 12x6, 6x12, or even 12x12. All necessary ribbon cables are included for up to 12x12 setups, which means no hunting down obscure connectors. The internal 34-wire ribbon cable linking the input and control modules is robust, and the separation of jacks (on the 8hp module) from the knobs (on the 25hp) keeps the panel uncluttered. It’s a rare case where expandability doesn’t come at the cost of usability.
DC coupled and level-flexible
Being DC coupled means the ADDAC814 doesn’t just pass audio—it passes anything. Envelope generators, sequencer voltages, random sources—they all move through the matrix with the same clarity as a sine wave. And with jumpers on the back to switch each channel between Line and Synth Level, you’re not stuck in one world. Want to bring in a line-level drum machine? Set those channels to Line. Running purely modular CVs? Flip them to Synth. It’s a level of adaptability that makes this module feel at home in hybrid systems, not just pure Eurorack rigs.
Historical Context
The ADDAC814 landed in a crowded week—two other companies, After Later Audio with their Keanu and Toppobrillo with the MatrixPlexer, released new matrix mixers at the same time. In that context, it was called “probably the most classic among the three new releases,” a nod to its straightforward, no-frills approach. While others leaned into digital control or touch interfaces, ADDAC stuck with analog pots and a physical layout that prioritizes clarity over novelty. That decision seems to have resonated: in a field of flashy newcomers, the ADDAC814 stood out by looking like something you’d actually use every day.
Collectibility & Value
The ADDAC814 is currently available as of May 2025, both as a fully assembled module and as a DIY kit. The 6x6 configuration (jacks + controls) as a kit costs €260 (excl. VAT), while assembled units have carried an original price of $379.99 or €389. Current market listings show some variation: Reverb lists it at $430.63, while other affiliate links show prices from $316 to over $400, suggesting no single dominant resale value yet. It’s not a rare grail, but it’s not disposable either—owners seem to hold onto it. With an average rating of Ø 4.00 from two votes, it’s too early to call it a classic, but the feedback so far is warm: “I like the ADDAC very much because it is very straightforward and stereo.” No wild claims, no hyperbole—just a solid tool doing its job well.
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