Originally Posted by jdshepard
I have a 2005 25' and was wondering the same thing. did you solve the mystery?
One of the air forums members directed me to the space under the front gaucho, street side. Sure enough there is a bundle of wire that emerge there. I used a continuity tester to ensure these were the two RCA cables that emerged behind the radio. Bingo. I installed a home sized powered subwoofer under the gaucho. There is also an electrical plug under there. The radio has outputs on the back and some settings you have to go thru in the radio manual to send signal to the sub. Itworks great.
However, I still never located the three RCA for audio video that would seem to be for a TV send/receive.
I purchased a small Bluetooth Bose sound bar for the TV instead. This also picks up my phone for calls and music. I think I'm finally done.