You should either say what make, model and year of your RV or add a signature that has the information so that people know what you are asking about without having to of to your profile to find out.
Speakers over the bed??? What bed? There shouldn't be any speakers in the back bedroom.
If you mean the over cab bunk, then those are the surround speakers. The middle one won't work unless you turn on the center channel in the dash unit.
They would be connected to the dash radio/CD/DVD player.
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Mine are connected to the cab stereo. They are the "rear" speakers as if they were in the back seat of a car...(sunseeker 2900). Try adjusting the fade/balance.
I did try that I got the center channel turn on and now that the only I can hear. I tried to adj far right then far left. Also tried to adj front to back.
Is it possible you have a unit that has the speaker selector switch? It is mounted on an upper cabinet and is labeled A/B/Both.
On mine on one of the options turned off those speakers - I guess so a person can rest up in the bunk while the audio plays in the other speakers in the living area.
If I recall the A/B/Both either turned off the over cab bunk speakers or the ones in the drivers cab.
I set mine to "B" so that all the house speakers are on for the kids to watch movies and listen to music. This also turns off the "cab" speakers and my wife and I can carry on a normal conversation. I turn on the "center" speaker in the overhead bunk with the "center" selection in the Magnadyne.