ADDAC System ADDAC807 (2017–)

A modular mixing console so fully realized it feels like the control room of your dreams—just don’t blink when you see the HP count.

Overview

When the ADDAC807 first surfaced in 2017, it didn’t just raise the bar for Eurorack mixers—it launched it into orbit. This isn’t a module; it’s a system. A full-blown, dual-module, 80 HP stereo summing console that treats your modular rig like a professional recording studio, complete with sends, returns, matrix routing, CV control, and a layout so intuitive it borders on psychic. It’s the kind of thing you see in a forum post and immediately start mentally rearranging your case, wondering what you can possibly sacrifice to make room. And then you remember: you’re not just adding a mixer. You’re installing a command center.

The ADDAC807 isn’t sold as a single unit. It’s a pair: the ADDAC807A (56 HP) is the main control surface, packed with faders, knobs, LEDs, and switches for hands-on manipulation. The ADDAC807B (24 HP) is the input console, housing all the jacks, CV inputs, and channel settings. Together, they form a 5-channel stereo mixer with an architecture that feels more like a Neve or SSL than anything you’d expect in a 3U rack. And if five channels aren’t enough? There’s the ADDAC807C expansion—another 38 HP that adds four more stereo channels, pushing the total to nine. At that point, you’re not just mixing—you’re conducting.

What sets the 807 apart isn’t just its size or feature set, but its philosophy. Most Eurorack mixers are utilitarian: sum some signals, maybe pan a bit, send to reverb. The 807 assumes you’re serious about mixing—about dynamics, spatial placement, signal flow, and automation. It gives you three stereo sends with pre/post switching, three stereo returns with level control and CV, a full matrix section for complex routing, cueing with balance and level control, and master outputs with both stereo and mono options. Every channel has volume and pan with CV control via attenuverters, mute buttons, and a cue/sends-only/mix switch that’s invaluable during live performance. The build quality is industrial-grade, with sturdy knobs, tactile switches, and a layout that’s dense but never chaotic. It’s the kind of module that makes you feel like a real engineer, not just a knob twiddler.

Specifications

Manufacturer	ADDAC System
Production Years	2017–
Original Price	1400.00 € (ADDAC807A + ADDAC807B)
Format	Eurorack
Width (Total)	80 HP (56 HP + 24 HP)
Depth	4.5 cm
Weight	1.5 kg (3.3 lb)
Channels (Base)	5 stereo
Channels (with ADDAC807C)	9 stereo
Send Channels	3 stereo
Return Channels	3 stereo
Matrix Section	Yes, with CV control
Cue Section	Yes, with balance, level, and CV
Master Outputs	Stereo and mono, with CV control
Individual Outputs	Available via ADDAC807A+ expansion (5 stereo)
Headphone Output	Yes, with volume and source selection
CV Inputs	±5V (per channel volume, pan, send, return, matrix, cue, master)
Max Current Draw	650 mA on +12V, 650 mA on -12V
Power Connector	8×2 IDC (Doepfer style)
Expansion Options	ADDAC807C (4 additional stereo channels), ADDAC807A+ (individual channel outputs)

Key Features

The Console Concept, Fully Realized

The most radical thing about the ADDAC807 isn’t its size—it’s its separation of controls and jacks. By splitting the system into the 807A (controls) and 807B (inputs), ADDAC created a workflow that mimics high-end studio consoles. The 807A is all hands-on surface: faders, knobs, switches, LEDs—everything you need to mix without looking down. The 807B handles the patching, with all inputs, CV jacks, and channel settings neatly arranged. This reduces cable clutter on the front panel and keeps your hands where they belong: on the controls. It’s a design philosophy borrowed from large-format analog desks, and in the cramped world of Eurorack, it’s nothing short of revolutionary. You’re not just mixing—you’re performing.

Sends, Returns, and the Matrix

The 807 doesn’t just sum signals—it routes them with surgical precision. Three stereo sends let you patch external effects (reverb, delay, distortion) with pre/post fader switching per channel. The returns are equally robust: stereo inputs with level control, CV attenuation, and cue/mix switching. But the real magic is in the matrix. This isn’t just a submix—it’s a full routing engine. You can send any combination of channels to the matrix, control its level and panning via CV, and route it to the master mix, cue, or even back into the sends. It’s perfect for creating dynamic transitions, parallel processing, or feeding a secondary mix to a recorder or stream. In an ecosystem where most mixers offer “send and pray,” the 807 gives you full orchestral control.

CV as a First-Class Citizen

Every critical parameter on the 807 is CV-controllable: volume, pan, send levels, return levels, matrix level, cue level, master level. And not just with simple inputs—each has its own attenuverter, so you can scale and invert the CV signal directly on the panel. This turns the mixer into a dynamic, modulatable instrument. Imagine automating a pan sweep across all channels, or having a sequencer modulate the send level to a reverb during a breakdown. The 807 doesn’t just sit at the end of your signal chain—it becomes part of the composition. In a world where “CV control” often means “one parameter, maybe,” the 807 treats voltage as a core design principle.

Historical Context

The ADDAC807 arrived at a time when Eurorack was maturing from a boutique curiosity into a serious music-making platform. By 2017, players like MakeNoise, Mutable Instruments, and WMD had already redefined what modular could do—but mixing was still an afterthought. Most users relied on simple passive mixers, or patched through external hardware. The 807 changed that by offering a fully integrated, studio-grade mixing solution that lived entirely within the case. It wasn’t the first Eurorack mixer with CV control, but it was the first to feel like a complete console.

Competitors like the WMD Performance Mixer offered automation and sends, but with fewer channels and a more utilitarian layout. The 807 went further, borrowing concepts from large-format analog desks and translating them into Eurorack’s language. It was a bold statement: that modular wasn’t just for experimental noise, but for serious composition, arrangement, and performance. Its closest analog wasn’t another module—it was a physical console like the Allen & Heath MixWizard, but with full CV integration. The 807 said, “You don’t need to leave the system to make a professional mix.” And for many, it delivered.

Collectibility & Value

The ADDAC807 isn’t a casual purchase. New, the base pair (807A + 807B) retails for 1400€, with the 807C expansion adding another 600€. On the used market, prices are high but stable: expect 1000–1300€ for the base pair in good condition, and 500–600€ for the expansion. Individual units are rare, and full systems (A+B+C) command premium prices, especially if complete with the ADDAC807A+ individual outputs module (90€ new, 70–80€ used).

Failures are uncommon, but not unheard of. The most frequent issues involve power draw—650mA per rail is substantial, and underpowered cases can cause instability or noise. The 8.2 IDC power cable must be properly seated, and users report occasional issues with jack solder joints on the 807B, especially if the module is frequently patched. The LEDs are bright and reliable, but the sheer number of them means a single failed LED driver IC could affect multiple indicators. No catastrophic failure modes are documented, but as with any high-current module, ensure your power supply can handle the load.

Buying used? Verify that all knobs and switches feel smooth, all LEDs respond to signal, and that the CV inputs respond predictably. Check for bent pins on the power connector and ensure the 807A and 807B are from the same production batch—early units had minor firmware quirks that were later resolved. Cases need to be deep enough (4.5 cm) and wide enough (80 HP minimum, 118 HP with expansion). If you’re serious about modular mixing, the 807 is worth the investment—but it’s not for the faint of wallet or the space-constrained.