Whomever at Keystone RV decided to put Summit 50" 4K televisions in the new 2021 Keystone RVs should be rounded-up and face a firing squad at dawn! The aft facing speakers in my Summit TV distorted the sound at any volume above MUTE!!!
After lots of research, I pulled the trigger and ordered a SAMSUNG HW-T550 2.1ch Soundbar with Dolby Audio/DTS Virtual:X which includes a wireless sub woofer:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The addition of the Samsung Soundbar and subwoofer to the Summit TV was a game changer with STUNNING sound! I'm no audiophile but I do know a great sound/upgrade when I hear it. The sound is now PURE, no distortion, and you are able to enhance the vocals of speech over the background music in videos and movies so you can actually HEAR the dialog over the background noise.
I was so impressed by the Samsung soundbar, I ordered and installed the optional Samsung SWA-8500S 2.0 Wireless Speaker System Wall Mountable Black Model (SWA-8500S/ZA) system for true surround sound as well:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
IMHO if you're looking to go beyond the distorted sound and rear facing speakers in the Summit tv and enjoy entertainment at a reasonable cost... do yourself a favor and install a Samsung soundbar, subwoofer and back speakers for surround sound as good as most theaters at a fraction of the costs. (NOTE: I placed the subwoofter behind my dual theater seats and mounted the soundbar below the Summit TV.)
Best investment/modification I've made to the new RV, so far.
Enjoy!
(DISCLAIMER: I am not affiliated with Samsung and have NOT been paid or offered a free audio system for my opinion and post.)