ADDAC System ADDAC807 (2017–)

A modular mixing console big enough to take over a case. Check the HP count before you buy.

Overview

The ADDAC807 first showed up in 2017. It is a dual-module, 80 HP stereo summing console with sends, returns, matrix routing and CV control. It treats a modular rig like a recording studio. Most people looking at one start by working out what to pull from their case to make room.

The ADDAC807 isn't sold as a single unit. It's a pair. The ADDAC807A (56 HP) is the main control surface, with the faders, knobs, LEDs and switches. The ADDAC807B (24 HP) is the input console, with all the jacks, CV inputs and channel settings. Together they make a 5-channel stereo mixer with an architecture closer to a Neve or SSL than to what you'd expect in a 3U rack. If five channels aren't enough, the ADDAC807C expansion adds another 38 HP and four more stereo channels, for a total of nine.

Most Eurorack mixers are utilitarian: sum some signals, maybe pan a bit, send to reverb. The 807 assumes you want to deal with dynamics, spatial placement, signal flow and automation. It has 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 and tactile switches. The layout is dense but never chaotic.

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 biggest design decision is the split between controls and jacks. The system is divided into the 807A (controls) and 807B (inputs), which mimics a high-end studio console. The 807A is all hands-on surface: faders, knobs, switches and LEDs, so you can mix without looking down. The 807B handles the patching, with all inputs, CV jacks and channel settings arranged together. That keeps cable clutter off the control panel and your hands on the controls. The idea is borrowed from large-format analog desks.

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. Each one has its own attenuverter, so you can scale and invert the CV signal directly on the panel. That means you can automate a pan sweep across all channels, or have a sequencer modulate the send level to a reverb during a breakdown.

Historical Context

The ADDAC807 arrived while Eurorack was growing from a boutique curiosity into a serious music-making platform. By 2017, 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 offered 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 borrowed concepts from large-format analog desks and translated them into Eurorack. Its closest analog wasn't another module. It was a physical console like the Allen & Heath MixWizard, but with full CV integration.

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 there are so many of them that a single failed LED driver IC could affect multiple indicators. No catastrophic failure modes are documented. As with any high-current module, make sure 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 make sure the 807A and 807B are from the same production batch, since 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).