Radial Introduces MIX 2:1 Passive Audio Summing Device

Radial has announced the MIX 2:1, a small mixer that passively sums two audio channels down to one. This enables users 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.

Radial said the inputs of the MIX 2:1 include both ¼-inch TRS and XLR connectors with ground lift switches to eliminate buzz and hum from ground loops and ensure noise-free operation. Each input can be individually engaged or disengaged, allowing users to audition either signal before summing both together.

A trim control is also featured on each input, so if the user is 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. Both level controls can be completely bypassed, summing inputs one and two equally. This can prevent accidental or unwanted level adjustments.

The MIX 2:1 has a 180-degree flip on input-2 to help solve issues with frequency cancellation due to the inputs being out of phase. 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.

The device is available now for $129.99.

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