Radial MIX 2:1T Two Channel Audio Combiner Mixer User Guide
- June 5, 2024
- Radial
Table of Contents
MIX 2:1T Two Channel Audio Combiner Mixer
User Guide
Thank you for purchasing the MIX 2:1™, a robust passive summing mixer that is a useful addition to any audio professional’s toolbox. While MIX 2:1 has been designed to be as easy to use as possible, please take a few minutes to review this short manual and familiarize yourself with the various features and uses of MIX 2:1. If you find yourself in need of more information, please visit our website at www.radialeng.com, where we post frequently asked questions from users like yourself. Should you still have any questions, drop us a line at info@radialeng.com and we will do our best to respond promptly.
OVERVIEW
The MIX 2:1 is a simple summing mixer that makes merging two audio signals easy. Whether you need to sum mic or line-level signals, or the outputs of two separate devices, the MIX 2:1 allows you to do so without noise or coloration of the sound. XLR and ¼” TRS inputs are provided for easy connectivity, with a single XLR output to feed your destination device. Level controls are available for each input that can be bypassed entirely to sum the left and right outputs of a mixing console or recording interface. A 180° polarity reverse switch opens up other options such as summing a snare top and bottom mic together to a single preamp, and ground lift switches help eliminate buzz and hum from ground loops. 
FEATURES
- On: Individually activates each input.
- Input Level: Sets the amount of attenuation applied to each input.
- 180°: Used to reverse the polarity on Input-2 to correct cancellation when summing out-of-phase signals.
- Level Bypass: Set & forget switch bypasses the level controls on inputs 1 and 2. When this switch is engaged, both inputs are summed together equally.
- Output: Mono XLR output is balanced to feed a powered speaker, mixing console, or a recording interface.
- Inputs: TRS ¼” or XLR connectors are available for inputs 1 and 2.
- Ground Lifts: Lifts the audio ground path on the XLR and ¼” inputs to reduce hum and buzz from ground loops.
- No-Slip Pad: Provides electrical & mechanical isolation and keeps the unit from sliding around.
MAKING CONNECTIONS
Before making connections, ensure that your sound system is turned off and all
volume controls are turned down. This prevents any plug-in transients from
damaging speakers or other sensitive components. The MIX 2:1 is passive and
does not require any power to operate.
The MIX 2:1 has both ¼” TRS and XLR connectors to accept balanced mic or line-
level signals. For best results, only use one of these connector types at a
time on each channel. The XLR output of the MIX 2:1 will also be mic or line-
level depending on your input sources and the amount of attenuation applied
using the input level controls. Keep in mind that the MIX 2:1 does not provide
any gain to the input signal, so if you connect two microphones to its inputs,
you will still need to feed the output into a microphone preamp to boost the
signal to line level. 
SUMMING A STEREO SOURCE TO MONO
With the MIX 2:1, you can quickly take a stereo feed from a mixing console or
a recording interface and sum it to mono to feed a single speaker input on a
PA system. Start by pushing the ON buttons for both inputs so they are both
active. Next, engage the recessed LEVEL CONTROL BYPASS switch on the right-
hand side of the MIX 2:1 – this will disable the input level controls for each
channel to ensure that the stereo balance is maintained.
The MIX 2:1 will automatically compensate for the 6dB in voltage gain that
occurs when two in-phase signals are summed together so you won’t distort the
inputs of your destination device. Should you need to attenuate the levels,
simply disengage the LEVEL CONTROL BYPASS and adjust each level control until
you achieve the desired results. 
SUMMING TWO SEPARATE SOURCES
The MIX 2:1 is also handy for summing audio signals from two different devices, such as a guitar mic and a passive DI, or top and bottom snare drum mics. When summing two separate sources, start with the input level controls fully clockwise (max) and use the ON switches to audition each channel individually. If one signal is significantly louder than the other, use the level control on that channel to achieve the desired balance between the two signals
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Combine two line-level outputs with a single input on your audio interface.|
The MIX 2:1 can also be used to sum two dynamic microphones together into a
single mic preamp.
USING THE 180° SWITCH
The MIX 2:1 includes a 180° switch that reverses the polarity of the audio on
INPUT-2 – this is sometimes referred to as a ‘phase reverse’. When two audio
signals have similar content but are reversed in polarity, certain frequencies
can be canceled or amplified when the signals are summed together, creating a
filtered or unnatural sounding result. The 180° switch can be a quick way to
reverse this effect and bring the signals back in alignment with each other,
resulting in a fuller and more balanced sound. 
USING THE
GROUND LIFT
When connecting two or more powered devices to each other, you may
encounter hum and buzz caused by ground loops. The MIX 2:1 is equipped with
ground lift switches on both inputs; these disconnect pin-1 on the input
connectors to break the electrical ground path and remove the noise. If you
experience any hum or buzz when using the MIX 2:1, simply engage these ground
lifts to help eliminate the problem.
BLOCK DIAGRAM
SPECIFICATIONS
Audio Circuit Type: ……………………… Passive Mixer
Frequency Response: ………………………20Hz-20kHz
Noise Floor: …………………………………. -113dBu
Dynamic Range: …………………………. >133dBu
Maximum Input: ………………….. >+20dBu
Gain: ………………………………………………… 0dB
Intermodulation Distortion:…………….. >0.002% @ 0dBu
Total Harmonic Distortion: ……………… >0.005% @ 0dBu
Common-Mode Rejection Ratio: ………………. >80dB
Phase deviation: ……………………………… 0° @ 20Hz, 0° @ 1kHz, +2° @ 10kHz
Input Impedance: ………………………….. 8k Ohms
Output Impedance: …………………………….. 1k Ohms
Insertion Loss: ………………………………………. -6dBu
Input connections: ………………………….. 1/4″ / XLR
Switches: ………………………………..180° phase, ground lift
Output Connector: ……………………………XLR
Power: ……………….. Passive, no power required
Construction: …………………..14-gauge steel chassis & outer shell
Finish: ………………….. Durable Powder Coat
Size (L x W x D): ………………… 5″x3.312″x1.78″ (LxWxH)
Warranty: ……………… Radial 3-Year, transferable
WARRANTY
RADIAL ENGINEERING 3-YEAR TRANSFERABLE WARRANTY
RADIAL ENGINEERING LTD. (“Radial”) warrants this product to be free from
defects in material and workmanship and will remedy any such defects free of
charge according to the terms of this warranty. Radial will repair or replace
(at its option) any defective component(s) of this product (excluding finish
and wear and tear on components under normal use) for a period of three (3)
years from the original date of purchase. In the event that a particular
product is no longer available, Radial reserves the right to replace the
product with a similar product of equal or greater value. In the unlikely
event that a defect is uncovered, please call
604-942-1001
or email service@radialeng.com to obtain an RA
number (Return Authorization number) before the 3-year warranty period
expires. The product must be returned prepaid in the original shipping
container (or equivalent) to Radial or to an authorized Radial repair center
and you must assume the risk of loss or damage. A copy of the original invoice
showing date of purchase and the dealer name must accompany any request for
work to be performed under this limited and transferable warranty. This
warranty shall not apply if the product has been damaged due to abuse, misuse,
misapplication, accident, or as a result of service or modification by any
other than an authorized Radial repair center.
THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF AND
DESCRIBED ABOVE. NO WARRANTIES WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD
DESCRIBED ABOVE OF THREE YEARS. RADIAL SHALL NOT BE RESPONSIBLE OR LIABLE FOR
ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE USE
OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY
ALSO HAVE OTHER RIGHTS, WHICH MAY VARY DEPENDING ON WHERE YOU LIVE AND WHERE
THE PRODUCT WAS PURCHASED.
Radial Engineering Ltd.
1845 Kingsway Ave., Port Coquitlam, BC V3C 1S9, Canada
Tel: 604-942-1001
Fax: 604-942-1010
Email: info@radialeng.com
Radial MIX 2:1™ User Guide – Part #: R870 1036 00 / 09-2021 Copyright © 2017
All rights reserved.
Appearance and specifications are subject to change without notice.
Made in Canada
Documents / Resources
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Radial MIX 2:1T Two Channel Audio Combiner
Mixer
[pdf] User Guide
MIX 2 1T Two Channel Audio Combiner Mixer, Two-Channel Audio Combiner Mixer,
Combiner Mixer
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