Audio Input; Audio Output - Q-See QC40198 User Manual

INSTALLATION & CONNECTION

3.6.1 Audio Input

This product uses BNC ports. Audio transmission is similar to video transmission. Try to avoid interference, keep
contacts snug and dry, and away from high tension current.

3.6.2 Audio Output

The audio output signal parameter is usually over 200mv 1K
earphone, active sound box or amplifier-driven audio output device. (See Figure 3-5)
If the sound box and the pick-up cannot be separated spatially, it is easy to get reverb or squeaking feedback. If
feedback occurs, try these tips:
Use better sound pick-up with better directing properties.
Reduce the volume of the sound box.
Using more sound-absorbing materials can reduce voice echo and improve acoustics environment
Adjust the layout to reduce occurrence of squeaking
QC40198/QC40196 User Manual
Figure 3-3
Figure 3-4
(BNC). It can directly connect to low impedance