ADDAC 200S (2023–)

A tiny, passive Eurorack module that fixes a daily patching headache. It needs no power and converts 1/4" to 1/8" right on your panel.

Overview

Every patcher hits this one. A full-size 1/4" jack has to go into a 3.5mm (1/8") Eurorack input, and the adapter is buried in a drawer or lost on the studio floor. The ADDAC 200S fixes that, and it lives on your rack so it's never out of reach. It's not a synth, not a processor, not even an active circuit. It's a passive, no-power interface that converts three 1/4" inputs to 1/8" outputs, in a 4HP Eurorack module.

The 200S is part of ADDAC's 200 Series, which is dedicated to analog CV utilities and practical modular helpers. It doesn't generate sound, shape envelopes, or modulate pitch. It removes friction. If you're bringing guitar pedals, line-level outboard gear, or studio monitors into your Eurorack setup, it replaces dangling adapters and makeshift cables that can pull loose or cause intermittent connections. The module has three independent 1/4" to 1/8" conversion channels, each with a sturdy jack on the front panel, so you can route multiple external signals straight into your modular system.

It looks trivial on paper. Eurorack's use of 3.5mm jacks has always made a minor but persistent barrier when interfacing with audio gear, which still runs on 1/4". Most users end up with a tangle of adapters, some poorly shielded, others prone to wobbling out of place. The 200S uses industrial-grade jacks and a solid aluminum panel, mounted securely in your case. It's not flashy, but it's reliable. You install it once and forget it.

Specifications

Manufacturer	ADDAC System
Production Years	2023–present
Original Price	55.00 €
Format	Eurorack
Width	4 HP
Depth	35 mm
Power	Passive (no power required)
Function	1/4" to 1/8" (3.5mm) jack adapter
Channels	3 independent conversion paths
Input Type	1/4" (6.35mm) mono or TS
Output Type	1/8" (3.5mm) mono or TS
Electrical Type	Passive signal pass-through
Panel Material	Anodized aluminum
Available Colors	Black, Red (standard); custom colors available
Custom Options	Green, Blue, White, Silver Gray, Yellowed Silver, Dark/Light Bronze panels; print colors vary
Mounting	Standard Eurorack 3U panel
Weight	Approx. 100 g (module only)
Country of Origin	Portugal

Key Features

Three Independent 1/4" to 1/8" Conversion Paths

The 200S has three dedicated channels, each converting a standard 1/4" jack to a Eurorack-compatible 3.5mm output. You can connect a guitar, a drum machine, and a line-level effects return at the same time, without swapping cables or daisy-chaining fragile adapters. The jacks are front-mounted and spaced to fit even large plugs, which is more than some DIY adapters can claim. There's no crosstalk and no signal degradation, just a direct pass-through. Since it's passive, there's no risk of noise injection, ground loops, or power draw complications. It's as transparent as a piece of wire.

Passive Design, Zero Power Draw

The 200S requires no power at all. In a Eurorack system where every milliamp counts, especially in skiffs or portable cases, a module that doesn't consume +12V, -12V, or +5V is welcome. It installs like any other module and takes up only 4HP. There are no circuits, no op-amps, no active components - just precision-machined jacks and internal wiring. That also means there's nothing to fail electronically.

Custom Panel Options for Personalization

ADDAC doesn't skimp on looks either. The 200S is available in standard black or red anodized aluminum panels, and the company offers a range of custom colors for builders who want their utility modules to match a theme. The range runs from deep bronze to bright yellow, with print colors that contrast for readability. Custom panels take 4-6 weeks to produce and cost extra.

Historical Context

The ADDAC 200S came out in 2023, as part of a broader shift in Eurorack toward practicality alongside sonic innovation. For years, the format thrived on wild, experimental modules: FM beasts, granular manglers, chaotic sequencers. As modular synthesis moved from niche hobby to professional tool, users began demanding more utility, more integration, and fewer headaches when connecting to the outside world. The 200S sits at the quiet end of that spectrum. It's not a sound generator, but a bridge. It fits ADDAC's long-standing habit of solving real-world problems in modular patching, seen in other 200 Series modules like the ADDAC200 (2HP multiples) and ADDAC200RM (rails monitor).

Other manufacturers have released similar adapter modules, some with buffering, others with level shifting. The 200S stands out for its simplicity and build quality. While many companies were adding DSP, MIDI over USB, and touchscreens to Eurorack, ADDAC went the opposite direction: a module so basic it could have existed in 1970, if Eurorack had existed then.

Collectibility & Value

As a modern, low-cost utility module, the ADDAC 200S isn't a collectible in the traditional sense. There's no vintage premium, no rare run, no circuit revisions to hunt for. It costs 55€ new. Used units typically sell for 30-40€, depending on condition and whether they include original packaging. Since the module has no active electronics, failure is extremely rare. Bent jacks from improper insertion or case over-tightening are the most common issue. Buyers should inspect the alignment of the 1/4" jacks and make sure the 3.5mm outputs aren't loose or wobbly.

It's still in production, so there's no urgency to buy, but it rarely stays on dealers' shelves for long. For builders assembling a new case, it's often one of the first utility modules added. The custom panel option adds a small resale premium, especially for uncommon colors like dark bronze or silver gray, but mostly it's a personal choice rather than an investment. If you're buying used, verify that the module wasn't modified. Some users have attempted to add buffering or switching, which defeats the purpose of its passive design.