Tapping into audio from a Motorola astro

I'm sure I'm leaving some pertinent info out here, so please feel free to ask any questions. At my firehouse, we have a Motorola astro 800hmz base station radio. The accessory out cable appears to have an audio feed that goes to the speaker attached to the bottom of the radio. I read some threads that explain that it is possible to tap into this feed. I would like to tap into this feed, safely, and send the audio to our amplifier to be distributed throughout the station to existing speakers.



The radio is on the Charlottesville/Albemarle 800 p25 system.



Thanks in advance for all the help.

Tapping into audio from a Motorola astro