Since this thread has to do with Concertone, which comes in many different campers, I moved it here to the Concertone section.
As for your speakers, turn the unit on, make sure only the "A" speakers are selected. Now go listen at each one, and see which ones are playing. Now turn "A" speakers off, all should be quite. Now turn on "B" speakers and repeat. And last do "C", which should be the outdoor speakers if equipped.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT