Corninr
You will need a power amp from the lineout of the camera.
But id of assumed that the arc would be communicating with the server so the audio will be from that, not the camera?
A standard PA amplifier can be used and you will need horns to suit. BUt the voltage on the speaker side is 100v, so you can only use 100v line speakers. ie the bosch.
YOu can use the walktest unit if you need 1 man setup but if there are 2 people you can setup with one watching the internal led, while the other walks the range.
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