ADDAC System 710 (2022–)

A silent guardian for your modular rig—this unassuming box kills ground loops and noise with the quiet confidence of a pro audio ninja.

Overview

You don’t notice it when it’s working—because that’s the whole point. The ADDAC System 710 slips into your Eurorack case like a stagehand in a black hoodie: essential, invisible, and absolutely critical to a clean performance. It’s not a sound generator or a processor that colors your tone; it’s the antidote to that low hum, the crackle, the interference that creeps in when your modular talks to the outside world. If your modular’s output ever sounds like it’s been recorded in a subway tunnel, the 710 is your ticket to silence. This dual-channel isolated DI box ensures that what leaves your system is exactly what you created—no extra artifacts, no crosstalk, no ground loops. It’s the difference between a polished live set and one that makes the sound guy wince before you’ve even played a note.

Designed as a streamlined alternative to ADDAC’s earlier 800X High-End Outputs, the 710 trades some audiophile-grade components for practicality without sacrificing core performance. It’s shorter in depth—just 40mm—so it fits in shallow skiffs and travel cases where space is at a premium. That makes it a favorite among gigging modular artists who need reliable, noise-free outputs without bulking up their rig. The module’s heart is a pair of audio transformers, each handling one channel with a flat frequency response from 20 Hz to 20 kHz. They provide galvanic isolation, which means no electrical continuity between your synth and whatever it’s plugged into—PA, audio interface, mixer, tape machine—so ground loops get severed before they can ruin your tone. It’s not magic; it’s just smart, old-school audio engineering packed into a 6HP panel.

Specifications

Manufacturer	ADDAC System
Production Years	2022–
Original Price	€138 (kit)
Format	Eurorack
Width	6 HP
Depth	40 mm
Power Consumption +12V	40 mA
Power Consumption -12V	40 mA
Channels	2
Output Type	Balanced (XLR)
Input Type	Unbalanced (1/4" TS)
Transformer Type	Audio, 1:1 impedance matching
Frequency Response	20 Hz – 20 kHz
Isolation	Galvanic, transformer-based
Ground Switch	LIFT/FLOAT/GND (3-way per channel)
DIY Kit	Yes (SMD and through-hole)
Panel Color	Black anodized aluminum
Mounting	Standard Eurorack 3U

Key Features

Transformer Isolation That Just Works

The 710’s magic lies in its pair of audio transformers, each handling one channel with a clean 1:1 signal transfer. These aren’t high-gain amplifiers or tone-shaping circuits—they’re passive, transparent conduits that block DC and eliminate ground loops by breaking the electrical connection between your modular and downstream gear. This is critical when connecting to mixers, audio interfaces, or PA systems that share different ground potentials. Without isolation, you get hum, buzz, or even damaging current flow. The 710 stops that cold. The transformers are rated for full audioband response, so there’s no roll-off or phase shift within the audible spectrum. What you send in is what comes out—just cleaner, quieter, and balanced.

Ground Management with a 3-Way Switch

Not all grounding problems are the same, and ADDAC knows it. That’s why each channel has a 3-way LIFT/FLOAT/GND switch. In LIFT mode, the ground is connected through a 100Ω resistor and 10nF capacitor—enough to drain stray noise without creating a full loop. FLOAT completely disconnects the grounds, ideal when you’re linking systems with incompatible grounding schemes. GND ties the input and output grounds together, useful when you’re in a controlled environment and want a common reference. Most users find themselves cycling through these options during setup, but once you find the sweet spot, the hum vanishes. It’s a small control with massive impact, and it’s rare to see this level of grounding flexibility in a module this size.

Compact Design for Real-World Use

At 40mm deep, the 710 is skiff-friendly—a big deal for Eurorack users who build portable systems. Many isolation solutions are deeper, forcing compromises in case selection or power supply clearance. ADDAC re-engineered the circuit from their earlier 800X to use a smaller transformer, trimming depth without sacrificing isolation quality. The front panel is clean: two input jacks, two XLR outputs, and the dual 3-way switches. No LEDs, no extra knobs, no distractions. It does one job and does it well. The black anodized aluminum panel feels sturdy, and the jacks are securely mounted. It’s not flashy, but it’s built like a tool, not a toy.

Historical Context

The ADDAC 710 arrived in 2022 as part of a broader trend in Eurorack: the shift from purely sound-generating modules to utility solutions that solve real-world integration problems. As modular systems grew more complex and began appearing in live and studio settings, the need for clean, professional-grade outputs became obvious. Many users were patching into audio interfaces or mixers only to be greeted by hum, buzz, or signal degradation. While some turned to external DI boxes, those added clutter and cabling. ADDAC’s answer was to bring pro audio isolation directly into the rack. The 710 sits in the 700 series, dubbed “Analog Heritage,” though it’s less about vintage tone and more about vintage reliability—using time-tested transformer isolation instead of active buffering or digital conversion. It competes indirectly with modules like the Intellijel Linus or the Mutable Instruments Yarns (in output mode), but those don’t offer galvanic isolation. The 710’s closest analogs are standalone DIs, but none fit in 6HP. It’s a niche product, but for those who need it, it’s indispensable.

Collectibility & Value

The 710 isn’t a collector’s item in the traditional sense—it doesn’t have rare components, limited runs, or cult status. But it’s quietly becoming a staple in touring and studio Eurorack setups, which gives it a different kind of value: utility. As of 2024, new DIY kits sell for around €138, with assembled units occasionally appearing on the used market for €160–€200. Because it’s a passive module with no active ICs or delicate tuning, failure rates are extremely low. The most common issue? Incorrect assembly by DIY builders—especially if the power polarity is reversed during installation. Always test with a multimeter before powering up. The kit includes both SMD and through-hole parts, rated as “easy/medium” difficulty, so beginners should proceed with caution. There are no user-serviceable parts once built, and the transformers aren’t replaceable without significant rework. When buying used, check for bent jacks or cracked solder joints, but otherwise, a working 710 should last indefinitely. It’s not a module you buy for resale value; it’s one you buy because you’re tired of noise.