Ok on the 29N there should be a DVD/CD/radio/ suround sound unit in the space above the corner cabinet just inside the door, there are or should be wires from the speakers in there and a subwoofer in that corner cabinet. Now they are not 12 volt, there is a 120v outlet in that cubby that you plug in the sterio unit into. We have been watching an RCA unit at Walmart, that is about 120 watts and is surround sound 5.1 that will repace it very nicely. After I said all that do you have ceiling speakers???
Mark, Debie & Belle the wonder dog
2013 Prime Time Crusader 36 ft 5er
2008 Chevy Silverado 2500HD crew cab, 6.0L