Originally Posted by 16ACE27
Generally, the overhead speakers are connected to the dash radio and the outside speakers are attached to the bedroom radio as "B" speakers.
Seconded. This is the way they’re connected on our Miramar (granted not a Challenger, but a sibling and most manufacturers don’t deviate too much from their plan, regardless of level of coach): Front cab and over the couch = Dash Axxera radio; Over the bed (A speakers) and outside (B speakers) = Bedroom Jensen radio.
We don’t use either as the sound quality is very sub-par and use a pair of Sony SRS-XB33 bluetooth speakers instead.