Radial Engineering MIX 2:1, Two-Channel Audio Combiner and Mixer

The Radial Engineering MIX 2:1 is a simple yet highly useful mixer that passively sums two audio channels down to one. This enables you to easily sum the stereo outputs of a console, recording interface, or portable playback device down to mono, or to mix any two signals together and balance their relative input levels. The MIX 2:1 uses a completely passive circuit that requires no power to operate and allows you to sum two signals together with minimal coloration or distortion. Either signal can be attenuated to create the desired blend between the two, or the level controls can be bypassed altogether, summing each input equally. The MIX 2:1 automatically compensates for the 6dB in voltage gain when summing two in-phase signals together, so you don’t overload the next device in your signal chain. Ground lift switches are provided to remove buzz and hum from ground loops, and the MIX 2:1 is housed in a rugged steel chassis to handle use in the studio and on the road.

Combine two balanced mic or line-level signals

The MIX 2:1 makes it easy to sum together any two signals, whether it's two microphones on a single guitar amplifier, or the stereo line outputs of a mixing console. At the inputs of the MIX 2:1, both ¼" TRS and XLR connectors are available, with ground lift switches to eliminate buzz and hum from ground loops and ensure noise-free operation. A trim control is also featured on each input, so if you are connecting two separate mono sources such as the outputs of two mic preamps, they can each be attenuated as needed to match their levels at the output. After both signals are passively summed together, they feed a single XLR output that can be connected to a powered speaker, or the input of a console or recording interface.

Summing a stereo source to a single channel on a console

When you’re short on channels, the MIX 2:1 allows you to sum a stereo output down to mono, using only one channel on the console.

Product Specifications:

Audio circuit type: Passive mixer

Frequency response: 20Hz to 20kHz

Dynamic range: >133dB

Total harmonic distortion: >0.005% @ 0dBu

Intermodulation Distortion: >0.002% @ 0dBu

Phase Deviation: 0° @ 20Hz, 0° @ 1kHz, +2° @10kHz

Input Impedance: 8 kΩ

Output Impedance: 1 kΩ

Common Mode Rejection Ratio: >80dB

Noise Floor: -113dBu

Maximum Input: >+ 20dBu

Input Connectors: 1/4", XLR

Output Connectors: XLR

Construction: 14-gauge steel chassis and outer shell

Size (L x W x D): 5" x 3.25" x 1.85" (12.7 x 8.3 x 4.7cm)

Weight: 1.48lb (0.67kg)

Shipping size (L x W x D): 6.25" x 4.12" x 3" (15.9 x 10.5 x 7.6cm)

Shipping Weight: 1.77lb (0.8kg)