O P E R A T I N G I N S T R U C T I O N S
The Headphone system
The Headphone (earphone) system in the MARC-15 console is provided
so that audio can be listened to while the microphone is active and the
monitor speakers are muted. The Headphone system receives the
same audio feed as the Monitor system but does not mute when the
microphone channel is turned on. The Headphone system has a 1/4"
headphone jack on the front of the module The headphone amplifier
connected to the headphone jack is designed to work with high imped-
ance and 8 ohm headphones. The module also has a balanced, line
level audio output for use with an external headphone amp.
CUE
The MARC-15 console features Autocue. Whenever a channel is placed
into cue, the audio in the Headphone system will mute and the Cue
audio will play over the Program signal.
TALKBACK
When talkback logic is activated from another studio, then Auto-cue is
activated, Headphone program audio is muted, and the audio from the
Talkback input is placed into the Headphone system for intercom.
MUTING
The headphone system is not muted. When the control room micro-
phone is turned on, the Monitor system will mute (audio is turned off)
so that there will not be feedback from the speakers to the micro-
phone. The headphone system can not have audio feedback so muting
is not required.
MONITOR SELECTOR SWITCH
This switch selects the audio source for the Monitor & Headphone
systems.
1) AIR- this is usually an off air audio feed to monitor the actual
transmitted signal
2) PGM- the main Program output bus from the console
3) AUD- a secondary Program bus that can be used for several pur-
poses such as Recording
4) UTL- a secondary Program bus that can be used for several pur-
poses such as Recording
HEADPHONE VOLUME FADER
Sets the headphone level to the internal headphone amplifier.
3.6
Cue
Monitor
Head
phone
Aud
Utl
Ext1
Pgm
Stop
Reset
Auto
Start
Timer
Output
Timer
Audio
selector
Headphone
Volume
Headphone
Jack