ADDAC 200B (2023–)

A tiny, no-frills buffered multiple that keeps your Eurorack signals clean and stable—until the power supply hiccups.

Overview

It’s easy to overlook a module like the ADDAC 200B. No blinking lights, no knobs, no wild sonic transformations—just eight jacks arranged in two rows on a 2HP panel. But plug it into a dense patch and you’ll feel its presence immediately: cleaner signal distribution, no dropouts when daisy-chaining multiples, and CV that doesn’t sag when you route it to five different destinations. This isn’t a sound generator or processor. It’s infrastructure. And in a modular system where a single weak link can unravel an entire patch, the 200B is the quiet electrician working behind the walls.

The 200B is a buffered multiple, meaning it actively maintains signal integrity across its outputs instead of passively splitting it like a passive multiple (such as ADDAC’s own 200). That makes it ideal for distributing critical control voltages—LFOs, sequencer outs, clock signals—where even slight voltage drops can throw timing off or detune oscillators. It’s also useful for audio when you’re sending a single source to multiple effects or filters and want to avoid loading down the output. The module splits its input into two independent sets of four buffered outputs, electrically isolated from each other. That means you can use one side for CV and the other for audio, or split up clock and reset signals without interference.

It’s not magic, though. The buffer only works in one direction: it won’t protect your source from feedback or reverse current, and if your power supply is noisy or underpowered, the 200B will dutifully pass that noise along to everything it feeds. It also draws power from both the +12V and -12V rails, so in a crowded case with tight power margins, stacking several buffered multiples can start to pinch. But for most users, the trade-off is worth it—especially in complex patches where stability trumps minimalism.

Specifications

Key Features

Signal Integrity Through Active Buffering

Unlike passive multiples, which simply wire inputs to outputs in parallel, the 200B uses an active op-amp-based buffer to maintain signal strength. This prevents voltage droop when splitting CV signals to multiple destinations—a common issue in passive setups where each added connection slightly reduces the voltage seen by downstream modules. In practical terms, that means your pitch CV stays accurate across multiple oscillators, and your LFO cycles remain consistent even when modulating several parameters at once. The buffer also reduces impedance, making it less likely that sensitive inputs will load down the source.

Compact Dual-Bank Design

The 200B packs two completely isolated buffered multiples into 2HP. Each bank has one input and four outputs, and there’s no electrical connection between them. This lets you use one side for clock distribution and the other for audio outs, or split modulation sources without crosstalk. The isolation also means you can patch one side into a noisy or high-impedance circuit without affecting the other. It’s a small thing, but in a system where ground loops and interference creep in silently, that separation is a quiet luxury.

Build Quality and Integration

Like all ADDAC modules, the 200B is built for Eurorack longevity: thick aluminum panel, precision-cut mounting holes, and high-quality jacks that resist wobble. The 1.5 cm depth makes it skiff-friendly, and the 2HP width means you can fit several in a row without guilt. It doesn’t draw much power, but because it uses both rails, it’s not ideal for ultra-low-power setups unless you’re only using one or two. The lack of LEDs or indicators is by design—this is a utility module, not a performance one. What you see is what you get: clean, silent operation.

Historical Context

The buffered multiple isn’t a new idea, but it’s become essential as Eurorack systems have grown more complex. In the early 2010s, many builders used passive multiples exclusively, often daisy-chaining them with patch cables. As patches got denser, problems emerged: CV inaccuracies, clock jitter, and audio level drops. Manufacturers like Intellijel, Doepfer, and ALM began offering buffered options, and the standard solidified around dual or quad buffered outputs with isolation. ADDAC entered this space later, but with a focus on minimalism and integration. The 200B arrived in 2023 as part of the expanded 200 Series, a line of utility modules designed to solve small but critical problems in patch flow. It wasn’t revolutionary, but it was timely—offering a reliable, compact solution from a brand known for thoughtful design.

At the time, the Eurorack market was saturated with boutique sound modules, but utility gear like multiples, attenuators, and logic modules often felt like afterthoughts—cheaply made or overly complex. ADDAC’s approach was to treat utilities as first-class citizens: well-built, clearly labeled, and designed to disappear into the system. The 200B fits that philosophy perfectly. It doesn’t try to be more than it is, and that’s why it works.

Collectibility & Value

The ADDAC 200B is too new to be considered “vintage” in the traditional sense, but it’s already established itself as a staple in many builds. As of 2026, it sells new for €65 directly from ADDAC, with authorized dealers like Perfect Circuit and Signal Sounds listing it for around $75 including shipping. Used units appear occasionally on Reverb and eBay, typically priced between $50 and $60 depending on condition. There’s no collector’s premium—this isn’t a limited-run module or a discontinued rarity. Its value lies in utility, not scarcity.

Failures are rare, but when they happen, they’re usually power-related. A few users have reported damaged buffers after power supply surges, particularly in cases with poorly regulated rails. The op-amps are surface-mount and not user-replaceable without soldering skill, so repairs usually require sending the module back to ADDAC or a qualified tech. There’s no field-serviceable fuse or protection circuit, so it’s wise to ensure your case has clean, stable power before relying on the 200B for critical signal distribution.

When buying used, check that all outputs pass signal correctly—sometimes one bank will go silent due to a broken trace or failed chip. Also verify the panel isn’t bent or over-tightened, as the thin aluminum can warp and cause grounding issues with adjacent modules. Otherwise, the 200B is about as low-risk as a Eurorack purchase gets. It doesn’t age, it doesn’t wear out, and it doesn’t go obsolete. If you need buffered multiples, this one does the job cleanly and quietly.

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