Welcome Matador 01 to the Newmar forum & irv2.
If you have the Aux unit which you may 03 coach there are audio inputs on it that you may be able to connect to your TV if it has RCA JACKS.
If you go to the Quick Tips & Mod's link you will see where I installed a DVD 5.1 system in my coach. This is what the AUX unit looks like we just have to find it for you.
All the wiring to your speakers are found in back of panel for access to your over head fans motor. All your spkers work only off your Sony radio. But we maybe able to change that.
I'll keep coming back to post here so we will cover everything.
This is what you will see when you open the panel back wall of over head cabinet.