This RZR got a complete JL Audio audio system starting with their MBT-CRX bluetooth receiver as the "headunit".  We installed a pair of MX650s in SSV works kick panels, and a single 10W1 sub woofer under the passenger side seat.  We powered the system with a MX280/4 bridged to run the speakers, and a MX300/1 on the sub.  We also installed ODX 4000 lumen LED headlights!