User's Manual

7
975 Back Panel 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. PAGEFIRST ADJUST: Use the Adjust control to adjust the sensitivity of PageFirst if needed.
3. PAGEFIRST INPUT: Connect the input from the optional PageFirst sensor here when interfacing
with a building’s paging system.
4. 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.
5. CONTACT CLOSURE: Internal relay contact closure to provide signal to notify external system
based on user input.
6. 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.
7. 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
Fire
Mute
Contact
Closure
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