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SSV Works RZ3-5A 5-speaker audio upgrade kit for the Polaris RZR: contains MRB3 receiver, four SSV Works speakers, 10" powered sub, 4-channel amp and mounting kits at Crutchfield
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Kicker Car Audio 5 Channel Amplifer with 10" 400W RMS 4-Ohm DVC Car Subwoofer, KS Series 6 1/2" Full Range Speakers (2), Harmony Audio 8 Gauge 900W Amp Install Kit | 44KXA8005RSPack1
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Amazon.com: Car Speaker and Amp Combo: 4X Kicker CSC5 450-Watt 5-1/4" Inch CS Series 2-Way Car Coaxial Speakers - Bundle with 400-Watts 4-Channel Bluetooth Amplifier + 8-Gauge Amp Wiring Kit : Electronics
SSV Works GN-5A 5-speaker audio upgrade kit for the Polaris General: contains MRB3 receiver, 4 speakers, 10" sub, 4-channel amp, and mounting kits at Crutchfield