After going through two RCA surround systems, I ordered a Harman Kardon
system for the rv. Now to the speakers. They are 4 ohm......system is 6-8 ohms. The existing speakers measure about 6.25" diameter. Is that a 6" speaker?
They seem to be some standard auto speakers with a spacer. Not sure you'll ever get quality sound out of them. Might be easier to stash a sound bar system in the unit.
I'm working on a bluetooth headset solution for mine so the wife can sleep while I watch TV.