Audio Signal Input; Audio Signal Output; Front Equipment Grounding Note - Digisol DG-CD2030HD User Manual

2-5-3 Audio signal input

Audio port is BNC connection.
The input impedance is high so the tone arm must be active.
The audio signal line should be firm and away from the electro magnetic Interference and connected
credible which avoid false and joint welding and oxidation. The high voltage current should be
avoided especially.

2-5-4 Audio signal output

Commonly the output parameter of DVR audio signal is greater than 200mv 1KΩ (BNC) which can
connect the low impedance earphone and active sound box or other audio output equipments
through power amplifier. If the sound box and the tone arm cannot be isolated, howling phenomena
is often observed. There are some methods to deal with the above phenomena.
1. Adopt better directional tone arm.
2. Adjust the sound box volume to be under the threshold that produces the howling
phenomena.
3. Use fitment materials that absorb the sound to reduce reflection of the sound.
4. Adjust the layout of the sound box and the tone arm.

2-5-5 Front equipment grounding note

Bad grounding can lead to the burnout of the chip.
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DVR User Manual