Neomatica, LLC. Terminal ADM700 3G GLONASS/GPS. Ed. 7.2, dd. 24.11.2018
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Figure 17
– Connection of loudspeakers to the amplifier built in the tracker (12 +U vehicle electrical system)
Connecting the line audio output of the tracker to an audio power amplifier.
This method provides the freedom of choice in relation to the required output power and the
number of loudspeakers because it is possible to select an amplifier with necessary characteristics.
It also allows to use the previously installed voice announcement system, if the system allows the
connection of external signal sources.
The input resistance of the audio power amplifier should be 10-50 kOhm. Schematic diagram
of the connection is shown in Figure 18.