You mighty try different sound system settings on the surround sound amplifier. I played around with it once and found that there were settings where sound did not come out of the rear speakers, just the front and sub-woofer. I had to use the manual to figure it out as there were many settings to choose from, now I have forgot them all. It had something to do with what sound environment you were trying to simulate, and what the source (DVD, CD) was capable of in terms of sound quality.
When I say "rear speakers" I am talking about the small black ones you described, not the two large white ones in the rear of the RV.
Bob
