Re: audio wiring question
Most modern school busses have pa system in them, but prison bus may be different. Also, most all wiring is initiated at the point above the driver's head, as that is where the radio and often the 2 way system back to the district is located. you probably gotta take off the upper panels for that part. If you are wiring in a jack and a rheostat by each speaker, i think all you gotta do is to remove the speaker, extend the wires as necessary, put the volume control in line first, and then your jack, and speaker. you would need enough extra length of wire so you can assemble it. Ya also gotta drill the holes for the 2 extra devices close to the speaker hole and re assemble after you have tested it for operation.. Not hard, but gonna be time consuming. You could also bring those controls out on the little L shaped brackets and screw them to the ceiling, but it wouldnt look as clean. And if you want to get really elaborate, run the wiring, etc into the back of the seat in front of each passenger....
Jesus Christ... Conversion in progress.