8
975 Controls and Connections
OVERVIEW
1. AUDIO INPUTS: 3.5mm stereo connectors for connecting
classroom audio sources to be played through audio system.
One optical digital input and one input priority. Input priority
mutes other audio to allow only input priority.
2. INPUT PRIORITY JACK: Additional 3.5 mm stereo connector
that automatically mutes other audio inputs when a signal is
detected.
3. PAGEFIRST ADJUST: Use the Adjust control to adjust the
sensitivity of PageFirst if needed.
4. PAGEFIRST INPUT: Connect the input from the optional
PageFirst sensor here when interfacing with a building’s
paging system.
5. RELAY INPUT: Senses external relay closure to mute 975 audio
when a signal from a fire alarm, IP paging system or other
device is detected.
6. CONTACT CLOSURE: Internal relay contact closure to provide
signal to notify external system based on user input.
7. SPEAKER OUTPUTS: This Euroblock connector is used to
connect the 975 to the loudspeaker(s). Up to two 8-ohm
speakers can be connected to each output.
Note: Wiring to these terminals should follow the Class 2 wiring
methods as outlined in the National Electric Code.
8. DC POWER: Plug the power supply (24V/2.5A) into this jack.
Input
Priority
Power
24VDC / 2.5A
Speaker Outputs
12
Audio Inputs
Class 2 Wiring
Optical
Adjust
Page
First
Relay
Input
Contact
Closure
1 32 874 5 6
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