DVR systems DVRxx04HF-A Series - Manual (Page 44)

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1U Series
1.5U Series
2u Series
Figure 3-3
3.7.2 Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (BNC). It can directly connect to
low impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In
this case you can adopt the following measures: