2hp Unity (2017–)

Name: 2hp Unity
Brand: 2hp

A tiny mixer that does what you need, when you need it, without taking space from the main modules in your rack.

Overview

The Unity has six inputs. It is two 3-channel unity mixers in 2HP, and thanks to the normalling it can turn into a single 6-in/1-out summing hub. It stays out of the way. In a format where every millimeter counts, it earns its space because it is useful in almost every patch, like blending three LFOs to modulate a filter cutoff or summing drum triggers before a logic module. It doesn't generate or shape sound. Try building a rack without one and it feels like a kitchen with no drawer for the odds and ends.

Most mixers sum signals and leave it at that. The Unity lets you choose how it sums. In Averaging Mode, audio signals keep their relative levels, so no voice overpowers the others just because it was the third one patched in. That helps when you're layering oscillators or blending effects returns, because there are no sudden volume jumps. Unity Mode is for control voltages. It sums CVs without attenuation, so vibrato depth adds cleanly, modulation sources stack predictably, and chaotic modulation networks stay coherent (or incoherent, depending on taste). Split Mode gives you both: one side averaging for audio, the other summing CVs.

And yet, for all its utility, the Unity doesn’t pretend to be more than it is. It’s not a VCA, not a processor, not a performance module. It’s a utility. But in the world of Eurorack, where patching is a language, utilities are the grammar. They’re the commas, the conjunctions, the silent “and” that lets two ideas coexist. The Unity speaks that language fluently. It doesn’t draw attention to itself, but remove it and your patches start to stumble. That’s the hallmark of good design: invisibility through effectiveness.

Specifications

Manufacturer	2hp
Production Years	2017–
Original Price	$89
Width	2hp
Depth	39.5 mm
Power Consumption +12V	10 mA
Power Consumption -12V	6 mA
Number of Inputs	6 (two groups of three)
Number of Outputs	2
Function	Dual unity mixer
Mixing Modes	Averaging Mode, Unity Mode, Split Mode
Normalling	Normalled to function as 6:1 mixer; unpatched inputs allow dual 3:1 operation
Unity Gain	Yes
Signal Type	Audio and CV capable
Color Options	Silver, Black

Key Features

Averaging Mode: The Quiet Hero of Audio Mixing

Most Eurorack mixers simply sum voltages. That is additive, unweighted, and prone to clipping when too many hot signals pile in. The Unity's Averaging Mode divides the sum by the number of active inputs, which keeps the overall level consistent. Patching a third oscillator into a mix doesn't make the stack twice as loud. This matters for live performance and complex patches where level stability counts. You don't need to reach for an attenuator every time you add a voice. It's not a compressor and it's not limiting. It's just math. Because it preserves the balance between sources, it also suits blending similar timbres, like parallel wavefolders or layered noise sources, without one dominating by sheer amplitude.

Unity Mode: Where Control Voltages Multiply

For modulation work, say routing three LFOs to a single filter cutoff, use Unity Mode. Unlike averaging, it sums CVs without division, so each input contributes fully. That is what you want when vibrato depth should scale with the number of modulators, or when you combine gate signals to trigger multiple events. It also suits chaotic modulation networks, where overlapping envelopes or random voltages create evolving textures. With no level reduction, the full dynamic range of each source is preserved. Averaging is polite sharing of the stage. Unity Mode is everyone shouting at once.

Split Mode: Two Brains, One Body

Split Mode lets one module mix audio on one side and CV on the other. It assigns Averaging to one mixer and Unity to the other. Say you're blending three drum outs while also summing three modulation sources for a wobble effect. Instead of two separate modules, you use one. That saves 2HP, and it also means fewer cables across your case.

Historical Context

The Unity arrived in 2017, when Eurorack racks were getting denser, more complex and more expensive. While other manufacturers chased feature-rich modules with screens, menus and endless algorithms, 2hp went minimal. The Unity wasn't the first dual mixer in 2HP, but it was one of the first to offer mode switching in such a compact form.

At the time, mixers were often afterthoughts, either passive components or oversized modules with unnecessary features. The Unity made the mixer an active part of the patch. It competed less with other mixers than with having no mixer at all. Why dedicate 4HP or 6HP to mixing when two channels could live in the space of a blank panel? It wasn't trying to beat Intellijel or Doepfer at their own game.

Collectibility & Value

The Unity isn't a collector's item in the traditional sense. There are no limited runs, no exotic finishes and no firmware revisions that change its behavior. New units still sell for around $89, and used ones trade between $60 and $75 depending on condition and color. Silver panels sometimes fetch a slight premium from buyers who prefer the original look, but the difference is marginal. The Unity remains in production, so there's no urgency to buy.

Reliability is part of its appeal. There are no moving parts, no trimpots to drift and no firmware to update. Failures are exceedingly rare, and documentation and user reports show no recurring hardware issues. The PCB is simple, the components are standard, and the build quality is consistent. If a Unity fails, it's usually a damaged jack or a power supply incident, not a design flaw.

When buying used, check for bent mounting tabs or cracked faceplates. Both are possible if the module was forced into a crowded rack. Test all inputs and outputs if possible, though given the simple circuit, failure is more likely from external damage than internal degradation. It draws little power (10mA on +12V, 6mA on -12V), so it's safe on crowded power buses. It needs no recalibration.