8724 V Tribrid NVR Installation Guide
24
Feature Overview
Audio Terminals
Audio in and out terminals are available on the main circuit board inside the unit (see “Main Circuit
Board” on page 21). Terminals provide line level audio input/output.
Audio Input
Connect an audio cable to the Audio In terminal block. Use the audio cable to connect an audio
input device, such as an active microphone, to the unit. Audio In pin 1 and 2 are the signals for
audio input channel 1 and 2 respectively. Connect the return to the “G” between the two audio
inputs.
If you are connecting a microphone to the unit, you must use a pre-amplifier to amplify the signal to
line level. Place the pre-amplifier close to the microphone for best results.
Input specification:
unbalanced, 10 k
Ω
, 1Vp-p (line level)
Audio Output
Connect an audio cable to the Audio Out terminal block. Use the audio cable to connect an
amplified audio output device, such as an intercom or speaker, to the unit. Ensure that the audio
output device (whether intercom or speaker) includes a built-in amplifier.
Audio Out pin 1 is the signal for audio output channel 1. Connect the return to the “G” beside the
audio output.
Output specification:
unbalanced, 600
Ω
, 1Vp-p (line level)
Audio terminals
Main circuit board
in unit
Terminal
Pinout
block
