My 2020 23RFBA has factory 8" Roswell speakers behind the rear loungers and they both sound horrible compared to the rest of the 6.5" Roswell speakers inside the boat; so much midrange I'm convinced there is definitely something wrong with the setup. I'm a sound engineer by trade, but do not see any wiring or settings issues. My dealer is baffled and ordered another head unit to try.Thanks for the replies, the speakers in the rear loungers are Roswell so don't think that's the issue, just not enough for tubing??
More output than clarity. My dealer is awesome and worked with Roswell (they were great too) because I also wanted speakers between the rear loungers and a second sub. I ended up adding an amp to support the additional speakers. I just don't think the rear facing speakers are there for tubing, more for swimming.
I put together this drawing of my setup to help during the install, might help you or someone else out.