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INTRODUCTION
Thank you for your purchase of the MX124 ProMix IV. This unit is designed and manufac-
tured to mix four microphones together and send their combined signals out stereo trans-
former-balanced XLR outputs, or front panel 1/4” and 1/8” stereo outputs. The individually
switchable phantom power and low-cut switches provide the final touches which make the
MX124 a valuable tool for any sound reinforcement, musical, recording, or install applica-
tion.
INSPECTION
1. Unpack and Inspect the MX124 package
Your MX124 was carefully packed at the factory in a protective carton. Nonetheless, be
sure to examine the unit and the carton for any signs of damage that may have occurred
during shipping. If obvious physical damage is noticed, contact the carrier immediately to
make a damage claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please visit our website at
www.rolls.com
, click on the Register Your Warranty Here
text and follow the instructions to register your MX124. Or complete the Warranty Regis-
tration Card and return it to the factory.
DESCRIPTION
REAR PANEL
Mic Input: 1 - 4: XLR balanced inputs for connection to any standard dynamic or condens-
er microphone.
Right and Left Outputs: Transformer balanced XLR output jacks for connection to the next
device in the signal chain such as a signal processor or amplifier.
Right and Left Trim controls: Screwdriver adjustable controls to vary the level of each
output. Turning these controls
clockwise
increases the output level. These controls do not
effect the Aux/Headphone Output.
FRONT PANEL
Mic Level 1 - 4: These controls adjust the level of the corresponding Mic channel. The
level varies from -infinity (off) to max gain.
PAN 1 - 4: Adjusts the relative right/left level of each channel.
Phone/Aux: 1/4” and 1/8” (3.5mm) TRS jacks which may be connected to a pair of head-
phones for personal monitoring, or to a stereo unbalanced input of a signal processor,
amplifier, or camera.
Clip LED: Indicates that clipping is about to occur or occurring in the MX54s circuitry. This
LED begins to light 3dB below actual circuit clipping.
RIGHT HAND SIDE
- Battery compartment which houses two 9-Volt (alkaline recommended) batteries.
- +12 VDC power jack for connection to the Rolls PS27; +12 VDC (outside of the ring is
positive) external power supply.
- Power Switch: Applies power to the MX124.
SCHEMATIC