The amplifier in your main unit is 50x4. This add on utilized the 2nd half of that amplifier. Includes brackets, hardware and instructions. Simply wire in speaker harness to your current unit then connect to the speaker add-on. NOTE THIS IS A 2 SPEAKER ADD ON TO USE WITH.SSV WORKS UTV WEATHER PROOF AUDIO SYSTEM P/N 63-4801. To Lower 48 States USA. Be sure to add me to your. SSV WORKS UTV POLARIS RZR/S/XP/570 2 SPEAKERS ADD ON. The item "SSV WORKS UTV POLARIS RZR/S/XP/570 2 SPEAKERS ADD ON With NEW 2014 FEATURES" is in sale since Wednesday, January 7, 2015. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Accessories". The seller is "crowescustomcycles" and is located in Battle Creek, Michigan. This item can be shipped to North, South, or Latin America, all countries in Europe, Australia, Japan.