ADDAC 710 Balanced Outputs (2022–)

A quiet workhorse that keeps your modular’s voice clean when it hits the outside world

Overview

It’s not flashy, doesn’t make a sound of its own, and won’t win any awards for sonic innovation — but if your Eurorack setup ever hums, buzzes, or crackles when you patch it into a mixer or audio interface, the ADDAC 710 Balanced Outputs might be the most important module you never knew you needed. This isn’t a sound generator or processor; it’s a peacekeeper. A diplomat between your delicate modular ecosystem and the messy, grounded reality of studio gear. Plug in your unbalanced 3.5mm modular outputs, flip a switch, and out come clean, balanced XLR signals that laugh at ground loops and impedance mismatches. It’s the kind of module you don’t appreciate until you’ve spent an hour chasing noise with a multimeter, cursing every cable and power supply in sight.

Designed as a streamlined alternative to ADDAC’s more feature-rich 800X High-End Outputs, the 710 strips things down to the essentials: two independent channels of transformer-isolated output, each with its own 3.5mm input, clip LED, and XLR output. The magic lies in the galvanic isolation provided by the 1:1 audio transformers, which break the electrical continuity between your modular and downstream gear. That means no shared ground, no sneaky current flows, and — if you set it right — no hum. It’s not overkill, not underpowered; it’s just what you need when you want your modular’s signal to arrive exactly as intended, without picking up the sonic equivalent of road dust.

Specifications

Manufacturer	ADDAC System
Production Years	2022–
Original Price	€160 (assembled), €105 (DIY kit, excl. VAT)
Format	Eurorack
Width	6 HP
Depth	40 mm
Power Consumption +12V	40 mA
Power Consumption -12V	40 mA
Inputs	2 x 3.5 mm jack (unbalanced)
Outputs	2 x XLR (balanced)
Transformer Type	1:1 unity audio transformer
Frequency Response	20 Hz – 20 kHz
Ground Lift Options	Lift (via 100Ω resistor + 10nF cap), Float (fully isolated), Ground (shared)
Clip Indicator	LED per channel
Panel Material	Black anodized aluminum
DIY Availability	Yes, SMD/through-hole hybrid kit

Key Features

Transformer Isolation That Actually Works

The 710 doesn’t rely on active electronics or digital trickery — it uses real analog transformers to provide galvanic isolation. Each channel’s 1:1 transformer ensures that the signal passes through without distortion while breaking any direct electrical connection. That’s critical in modular setups where ground loops are the usual suspects behind low-frequency hum. The transformer’s frequency response covers the full audible spectrum, so there’s no roll-off or coloration that might muddy your bass or dull your highs. It’s transparent by design, which is exactly what you want from an output module. This isn’t about adding character; it’s about preserving it.

Three-Way Ground Control: Lift, Float, or Ground

What sets the 710 apart from basic DI boxes is its three-position ground switch per channel — Lift, Float, and Ground. The Lift position connects the ground through a 100Ω resistor and 10nF capacitor, offering a compromise that often kills hum without fully disconnecting. Float completely isolates input and output grounds, ideal when you’re dealing with multiple grounded devices in a complex chain. Ground simply ties everything together, which might be necessary in some setups but risks bringing back the very noise you’re trying to avoid. The ability to toggle between these on the fly means you can adapt to any studio environment, from a simple laptop rig to a full patch bay with outboard gear. It’s a small switch, but it’s the difference between a clean signal and a 50/60 Hz drone that makes your mix sound like a refrigerator.

DIY-Friendly Design with Real Build Flexibility

ADDAC didn’t just build a module — they built a kit that invites participation. The 710 is available as a DIY kit that includes both SMD and through-hole components, rated as “Easy/Medium” in difficulty. For synth enthusiasts who enjoy soldering and want to understand exactly what’s inside their rack, this is a satisfying build. The manual is thorough, and the layout is clean, with clearly labeled silkscreen and well-spaced pads. And if you’re the type who likes your rack to match your aesthetic, ADDAC offers custom front panels in a range of colors — bronze, silver, red, green, you name it — though they come with a wait and a price bump. It’s a nice touch for those who treat their modular not just as a tool, but as a personal instrument.

Historical Context

The ADDAC 710 arrived in 2022, a time when Eurorack had long since moved past its niche hobbyist roots and into professional studios, live rigs, and hybrid production setups. As modular systems grew in complexity, so did the headaches of integrating them with conventional audio gear. While many manufacturers focused on new oscillators, filters, or sequencers, ADDAC recognized a quieter but equally critical need: reliable, noise-free output. The 710 fits into their 700 Series, dubbed “Analog Heritage,” which includes utility modules like the 711 Balanced Inputs and 712 Vintage Pre. It’s not a flashy addition to the lineup, but it speaks to a maturing ecosystem where signal integrity matters as much as sonic experimentation. Competitors like Mutable Instruments or Intellijel offer output solutions, but few provide the same level of transformer-based isolation in such a compact, affordable form. The 710 isn’t trying to reinvent the wheel — it’s just making sure the wheel doesn’t squeak.

Collectibility & Value

As a relatively new module, the ADDAC 710 isn’t yet a “collector’s item” in the vintage sense, but it’s already earned a reputation as a reliable, no-nonsense utility piece. On the secondhand market, assembled units typically sell for between €120 and €150, depending on condition and whether they include the original packaging or documentation. DIY kits in unopened condition go for around €90–€110. Since it contains no moving parts or volatile components, failure rates are extremely low — the most common issues are mis-soldered joints on DIY builds or damaged XLR jacks from rough handling. The transformers themselves are robust and not prone to degradation. For buyers, the main concern isn’t reliability but authenticity: make sure you’re getting a genuine ADDAC board, as counterfeit Eurorack modules do circulate. The clip LEDs are a small but useful feature — if they’re not lighting up, check the power connection first, as the module draws equal current from both rails. Overall, it’s a low-risk purchase, especially if you’re building a modular setup that needs to interface cleanly with external gear. It won’t appreciate like a vintage Roland, but it’ll save you hours of troubleshooting — and that’s worth more than any resale premium.