Speaker wires on a 2003 Sprinter 292

[arklahunter1]

I bought a used Sprinter 292 5th wheel and don't really know much about the camper. I see it has 4 speakers, two by the entertainment center and two by the rear. For the life of me I cannot see any leads for the speakers anywhere around the entertainement center. They have to be somewhere, but I can only find 120v plug 12Vlt pug and the coax cable for the antena. I am at a loss.