The heart of these Stage 5 Rokker XXR kits are a 2 or 4 channel Rokker XXR amplifier rated at 175w RMS per channel. Tuned for your use with your specially flashed Harley infotainment radio. Fully weatherproof and very durable speakers will perform at high volume levels for extended periods of time. Each kit is completely assembled together with the Harley Infotainment radio & amplifier dialed in for each exact speaker configuration, to provide THE BEST on-highway volume, clarity and overall performance available, from your music source selections of FM stereo, XM sat radio, Smartphone or USB thumb drive.; 2 channel ROKKER XXR amplifier rated at 175w RMS per channel X 2 to provide up to 350w total RMS power 100% plug-and-play The amplifier will be custom tuned for use in conjunction with your specially FLASHED Harley Infotainment radio Included are J&Ms fully weatherproof 6.71" ROKKER XXR speakers featuring a high-tech woven-fiber woofer cone and a massive high-density high-flux strength Neodymium magnet structure with large center and perimeter positioned voice coil cooling vents, to provide for maximum heat dissipation when operating at high volume levels for extended periods The custom designed speaker grills with mounted high-output dome tweeters are also weather-proof and shock-proof for maximum long-term durability