ADDAC 807A+ (2017–)

A 6HP module with a few jacks and one LED. It unlocks individual channel outputs on the ADDAC807 mixing system.

Overview

It doesn't look like much: a blank black panel with a few jacks and a single LED. No knobs, no switches. Plug it in and the ADDAC807 mixer stops being a tightly integrated console and gets a lot more flexible. The main console has faders, sends, and a matrix worthy of a broadcast studio. The 807A+ does one thing: it gives you direct, post-fader stereo outputs for each of the five main channels. That might sound trivial, but routing flexibility is what separates a good patch from a great one.

The 807A+ is 6HP and draws zero current. It needs a place on your bus board and a patch cable or two, and that's all. Need to send individual channels to an external recorder? Done. Want to process one synth line through a vintage outboard compressor while keeping the rest internal? Easy. Building a live setup where stems need to be isolated for in-ear monitoring or front-of-house routing? Same answer. The 807A+ doesn't change the sound - ADDAC's console is already known for its clean, high-headroom signal path - but it expands what you can *do* with that sound.

The ADDAC807 system was never cheap. At nearly 1,500€ for the base A+B pair, it's a commitment. The 807A+ is for people who have already made that leap and wanted more. It's not a standalone product, just a utility that completes the system. Owners report it feels like a missing piece finally found. The console's design philosophy of clarity, control, and cinematic-level routing carries into this expansion. It has clean, labeled jacks and a small LED that lights when a signal is present.

Specifications

Manufacturer	ADDAC System
Production Years	2017–
Original Price	90.00 €
Format	Eurorack
Width	6 HP
Depth	2 cm
Power Consumption	0 mA @ +12V, 0 mA @ -12V
Function	Individual Channel Stereo Outputs Expansion
Outputs	5 x Stereo Post-Fader Outputs (one per channel)
Indicators	1 x Signal Presence LED
Bus Board Connection	8 × 2 IDC (Doepfer style)
Compatibility	Requires ADDAC807A VC Stereo Summing Mixer

Key Features

Post-Fader Channel Outs for Precision Routing

The 807A+ delivers what its name promises: individual stereo outputs for each of the five main channels on the ADDAC807A, all taken post-fader and post-pan. What you hear in the mix is exactly what gets sent out, with no offset adjustments. That matters for stem recording, live multitracking, or integrating modular with DAWs. Passive mults can load down the signal or introduce crosstalk. The 807A+ uses the console's own buffered outputs instead, preserving signal integrity. The result is a clean, isolated feed that behaves like a professional console's direct outs. Most mixers in this format offer only a master output or maybe a couple of aux sends, so this level of access is rare.

Zero Power, Maximum Utility

The 807A+ draws absolutely no current. It's a passive breakout, piggybacking on the power and signal path of the main 807A module. That makes it easy to install - no worrying about overloading your power supply. At only 2 cm deep, it's also skiff-friendly. The physical design follows ADDAC's minimalist look: black panel, white silkscreen, no extraneous controls.

Seamless Integration with the 807 Ecosystem

The 807A+ isn't a standalone product. It only functions when paired with the ADDAC807A, and it connects via the same internal ribbon cable system used by the 807C expansion. That gives a clean, noise-free connection without the clutter of patch cables. Documentation shows that the module is recognized by the console's internal logic, with the LED indicating signal presence only when the corresponding channel is active and routed correctly. There's no calibration, no setup, no menu diving. Plug it in, power up, and go.

Historical Context

The ADDAC807 was announced in 2017. At the time, Eurorack mixers were often afterthoughts - simple summing buses with a few VCAs. ADDAC delivered a full-featured console with faders, sends, returns, a matrix, and CV control over nearly every parameter. It was inspired by large-format studio desks, in layout and in philosophy: a central hub for mixing, routing, and performance. The 807A+ arrived as an extension of that vision, responding to early user feedback that the console lacked individual channel access for external processing or recording. Rather than bolt on a workaround, ADDAC designed a dedicated expansion that maintained the system's integrity. This mirrored a broader trend in high-end Eurorack design, with companies like Intellijel, Mutable Instruments, and ALM pushing toward integrated, console-like systems rather than collections of discrete modules.

Collectibility & Value

The 807A+ costs 90€ for a passive 6HP module, which might raise eyebrows. On the secondhand market, complete ADDAC807 systems with A, B, C, and A+ modules command over 2,000€, and the A+ is rarely sold separately. When it does appear, it typically fetches 80-100€. Collectors note that original-run units from the 2017-2019 period are preferred, as later revisions may have minor silkscreen changes, though no functional differences. Service technicians observe that failure rates are near zero - no active components, no power draw, no moving parts. The only reported issues involve ribbon cable connections, which can loosen over time; a quick reseat usually fixes it. For buyers, the checklist is short: verify compatibility with your 807A firmware (all versions support the A+), check for clean solder joints, and make sure the LED responds to signal.