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Operation, cont'd
Program audio mute
To mute the program audio output, press the Program Audio Mute button. The
indicator LED to the right of the button will light when the program audio is
muted. Press the Program Audio Mute button again to unmute the output.
Program audio mute does not mute the microphone.
Microphone controls
Turn mic or phantom power on/off
To turn on the microphone power (15 V on the MPS 112, 48 V phantom power on
the MPS 112CS), press and hold the Mode button for more than 2 seconds until the
front panel LEDs change to view mode, then press and release the Mic Power On/
Off button. On both switchers, while the Mode button is pressed, the fourth LED of
the Video/Audio group is lit when the mic power is on. On the MPS 112CS, the
Phantom Power LED on the rear panel is also lit when the phantom power is on.
Release the Mode button when the power has been turned on or off (the LED will
resume input indication).
Mic mix
To mix the microphone input with the program audio output ("talk-over" mode),
press the Mic Mix button. The indicator LED to the right of the button will light
when the Mic Mix is on. Press the Mic Mix button again to unmix the output. In
"talk-over" mode, the main audio level is lowered when the microphone picks up
speech.
Mic volume
After turning on the mic mix, use the Mic Volume control knob to adjust the
volume of the microphone output. When the volume control knob is turned, the
volume will increase at a rate of 1 dB per step of the digital potentiometer.
Reset mic volume
To reset the mic volume to the default level (0 dB), press and hold the Mode button,
then press and release the third button (labeled Mic Vol. Reset) of the Video/Audio
group within two seconds. Release the Mode button when the volume has been
reset.
Setting mic "talk-over" threshold
1.
2.
3.
4.
3-6
MPS 112 Series • Operation
Finish installation wiring and setup as described on the previous sections.
Turn on the microphone by pressing the Mix button.
Speak into the microphone in a normal voice; the main program audio level
should drop moderately. If not, lower the threshold by pressing and holding
the Mix button and turning the Mic Volume knob counterclockwise.
Stop speaking into the microphone; the main program audio should recover to
the previous level after approximately four seconds. If not, increase the
threshold by pressing and holding the Mix button and turning the Mic
Volume knob clockwise.
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