Here is what I did to fix my Concertone!
This is a JVC head unit for a car with a CD player. my neighbor who can do just about anything with wood made a plate to cover the old Concerthole! LOL. I use an adapter to get the DVD audio to the front aux. in jack on the radio. I also wired in an old Sony amp I had laying around to power the subs in the ceiling.
Since I don`t have the A,B,C speaker switches any more I wired in these Radioshack switches to turn on and off the outside speakers and inside rear speakers. to turn off the inside front speakers i just fade the radio to rear only. this way the sound will only be outside.
I have a total of $105 in this fix and the sound from it is worlds better. and it picks up stations much clearer now.
02 Ford Excursion V-10 4.30 gears 5 Star Tuner Y-pipe mod Hellwig sway bar Rear Airbags
Prodigy and Dual Cam
07 Cherokee 32B
Better to have a bad day of camping than a good day at work!