we also have a new Springdale and I am not a big fan of the Jensen system. One of the speakers blew while we had a movie on, was not playing it loud.
Anyway, the A button controls the two front speakers, the B button controls the rear two speakers, C controls outside. A and B together gets you all 4 interior speakers. Quick question for you: Can you play the audio from your television through the Jensen system? Not a movie but just the Television? I can't, so I was just wondering if they forgot a cable or if they did this on purpose.