Radial Engineering PRO MS2 User Manual page 4

The ISOLATED output is used to feed a second mixing console and employs
a high performance Eclipse mic bridging transformer to eliminate the hum
and buzz caused by ground loops. Ground loops are commonly encountered
when connecting two audio systems together and can be heard as hum or
buzz in the audio system. The ISOLATED output breaks the ground loop
between equipment and allows a second system to operate without noise.
Connecting the ProMS2
Before connecting the ProMS2 make sure the sound system is turned off
and all levels are set to zero. This will avoid any connection transients that
could cause damage to speakers. Confirm that the PAD and LIFT buttons
are set to their outward position. The ProMS2 is completely passive and
does not require a power supply to work.
Using balanced XLR cables, connect the output of a microphone or
direct box to the ProMS2 INPUT. Next, connect the DIRECT-1 output to
your primary mixing console. If you are using a condenser microphone or
active direct box, turn on the phantom power. It's important to note that the
mixing console supplying +48V phantom power must be connected to the
DIRECT-1 thru-put XLR jack. The other outputs, DIRECT-2 and ISOLATED,
should not be used to pass phantom power back to the mic or direct box.
Turn on your audio system and test the signal at a low volume to ensure
the ProMS2 is properly connected and the microphone is working. After the
primary mixing console is working, connect the ISOLATED output to your
second mixing console such as a monitor or recording system. Test the
second system to ensure all is working well.
The ISOLATED output is equipped with a ground LIFT switch that decouples
the signal ground. If you hear hum or buzz after connecting the ISOLATED
output depress the LIFT switch to eliminate the noise.
DIRECT-1 ISOLATED
PRIMARY SYSTEM SECOND SYSTEM
The DIRECT-1 output connects to the mixer that will supply phantom power to condenser mics
and active D.I.'s. The ISOLATED output connects to your second audio system and prevents
ground loop noise between systems
Radial Engineering Ltd. ProMS2 Microphone Splitter