Well now that it’s all done I figure I will go ahead and post this. I made a custom speaker box for my cousins 2015 Rzr 900s. His cage was chopped about 4" and now includes JbL marine Bluetooth head unit, 4 6.5" kicker marine speakers and a 10" kicker marine subwoofer. They are all powered by a 800.5 kicker marine amp. The enclosure is fiberglass with a bedliner paint.
I will post pictures of the build later