Speakers outside only on 3650RL

[D_BTravelers]

We purchased a new 3650RL in January and I was surprised to find the AM/FM DVD player did not have any speakers inside the unit. Yes it has a sound bar but if you are not on shore power it will not work. We had a Rockwood Windjammer with 6 speakers in the main cabin, speakers outside, plus a subwoofer! Why have an A B C button for speakers when you only have C speaker?
I am looking into putting some good 8 olm speakers behind the TV and maybe a subwoofer too.