Arcus Audio — Unity Mixer

Manual PDF

Unity Mixer Manual PDF

Unity Mixer (Arcus Audio) – Cheat Sheet

Overview

Type: Dual 3:1 Unity Gain Mixer (Can act as single 6:1)
Size: 2HP (0.4”)
Function: Sums up to 3 signals per mix (2 mixes), or 6 into 1 if chained
Signals: Audio or CV
Indicators: Bi-color LEDs per output show level & polarity

Jack Reference

Jack	Type	Description	Voltage Range
IN 1.1–1.3	Input	Inputs to Mixer 1 (DC coupled)	-∞ to +∞ (limited by power rails, typical for Eurorack ~±10V)
OUT 1	Output	Output for Mixer 1 with LED	Follows summed input
IN 2.1–2.3	Input	Inputs to Mixer 2 (DC coupled)	-∞ to +∞ (±10V suggested)
OUT 2	Output	Output for Mixer 2 with LED	Follows summed input
> Note: To use as 6:1 mixer, patch OUT 1 into an input of mixer 2.

Controls / Indicators

Control / Indicator	Type	Function
OUT 1 LED	Bi-color LED	Shows level and polarity for OUT 1 (Green = positive, Red = negative voltage)
OUT 2 LED	Bi-color LED	Shows level and polarity for OUT 2 (Green = positive, Red = negative voltage)

No knobs, buttons, switches, or sliders.
All mixing is performed at unity gain (no level controls).

Installation & Specs

Mounting: 2HP width, M3 x 6mm screws included, aluminum faceplate
Power: 10" power cable included
- +12V: 15 mA
- -12V: 15 mA
- +5V: 0 mA
Input Impedance: 10 kΩ (DC coupled)

Typical Usage

Summing audio or CV sources (e.g. mix 3 VCOs, or sum several LFOs/envelopes into one bus).
Dual 3-to-1 Mixer: Use both sections independently.
Single 6-to-1 Mixer: Chain OUT 1 to an IN of Mixer 2.
Polarity/Loudness Indication: LEDs give instant feedback for troubleshooting or creative applications.

Quick Patching Guide

Patch up to 3 sources to each group of inputs (IN 1.1–1.3 or IN 2.1–2.3).
Take summed output from OUT 1 or OUT 2.
Chain modes: To combine all 6 inputs, patch OUT 1 into any input of mixer 2, take OUT 2 as final sum.
Watch the LEDs: Green = positive voltages dominate, Red = negative.

No normalization or advanced controls – simple utility for clean, compact summing with visual feedback.

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