ADDAC 807A+ (2017–)

A tiny slab of silent superpower—this unassuming 6HP module unlocks individual channel outputs on one of Eurorack’s most revered mixing systems

Overview

It doesn’t look like much: a blank black panel with a few jacks and a single LED. No knobs, no switches, no drama. But plug it in, and suddenly your ADDAC807 mixer transforms from a tightly integrated console into something far more flexible—a modular engineer’s dream. The 807A+ is the quiet enabler, the backstage pass, the one expansion that makes the whole ADDAC807 ecosystem breathe. While the main console dazzles with faders, sends, and a matrix worthy of a broadcast studio, the 807A+ does one thing, and does it perfectly: it gives you direct, post-fader stereo outputs for each of the five main channels. That might sound trivial, but in a world where routing flexibility separates a good patch from a great one, this is the difference between mixing in a box and building a studio.

The genius of the 807A+ isn’t in reinvention—it’s in restraint. At just 6HP and drawing zero current, it doesn’t ask for space or power, only a place on your bus board and a patch cable or two. It’s the rare module that doesn’t demand attention, yet becomes indispensable the moment you try to work without it. 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? This is your ticket. The 807A+ doesn’t change the sound—ADDAC’s console is already known for its clean, high-headroom signal path—but it radically expands what you can *do* with that sound.

And let’s be honest: the ADDAC807 system was never for the faint of wallet or shallow of rack. At nearly 1,500€ for the base A+B pair, it’s a commitment. The 807A+ arrives as a quiet “yes” to those who’ve already made that leap and realized they wanted more. It’s not a standalone product, not a flashy upgrade—just a utility that completes the vision. Owners report it feels less like an add-on and more like a missing piece finally found. The original console’s design philosophy—clarity, control, and cinematic-level routing—extends seamlessly into this expansion. No kludges, no compromises. Just clean, labeled jacks and a small LED that lights when a signal is present, because even in the dark, you should know when your channels are hot.

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. That means what you hear in the mix is exactly what gets sent out—no guessing, no offset adjustments. This is critical for anyone doing stem recording, live multitracking, or integrating modular with DAWs. Unlike passive mults, which can load down the signal or introduce crosstalk, the 807A+ uses the console’s own buffered outputs, preserving signal integrity. The result is a clean, isolated feed that behaves like a professional console’s direct outs. In an ecosystem where most mixers offer only a master output or maybe a couple of aux sends, this level of access is rare—and transformative.

Zero Power, Maximum Utility

In a format where every milliamp counts, the 807A+ draws absolutely no current. It’s a passive breakout, piggybacking on the power and signal path of the main 807A module. This makes it not just efficient, but fearless to install—no need to worry about overloading your power supply or rearranging your rack for a few extra millimeters. At only 2 cm deep, it’s also skiff-friendly, a rare win for such a functional module. The physical design mirrors ADDAC’s minimalist aesthetic: black panel, white silkscreen, no extraneous controls. It’s built to disappear into your system, which is exactly how it should be. When a module does one thing, it should do it quietly and well.

Seamless Integration with the 807 Ecosystem

The 807A+ isn’t a standalone product—it’s a key in a lock. It only functions when paired with the ADDAC807A, and it connects via the same internal ribbon cable system used by the 807C expansion. This ensures 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. This tight integration means no calibration, no setup, no menu diving—just plug, power, and go. It’s a testament to ADDAC’s system-level thinking: every module, even a passive one, is part of a larger architecture.

Historical Context

When the ADDAC807 was announced in 2017, it landed like a manifesto. At a time when 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, not just in layout but in philosophy: a central hub for mixing, routing, and performance. The 807A+ arrived as a natural extension of that vision, responding to early user feedback that while the console was powerful, it 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 approach mirrored a broader trend in high-end Eurorack design—companies like Intellijel, Mutable Instruments, and ALM pushing toward integrated, console-like systems rather than collections of discrete modules. The 807A+ wasn’t just a product; it was a statement that modular could be both flexible and meticulously organized.

Collectibility & Value

The 807A+ trades at a premium relative to its size and complexity—90€ for a passive 6HP module might raise eyebrows. But in context, it’s a bargain. 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€, reflecting its role as a rare but critical upgrade. 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 advice is simple: verify compatibility with your 807A firmware (all versions support the A+), check for clean solder joints, and ensure the LED responds to signal. Given its passive nature, there’s little to go wrong—but also little reason to skip it if you’re serious about using the console to its full potential.