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The Alpine PSS-23WRA Powered System Upgrade for 2018 and newer Jeep Wrangler Unlimited JL includes a powered 8 inch subwoofer, 4 channel amplifier, replacement tweeters as well as all the wiring needed for a complete plug and play installation. The amplifier boosts the audio signal to the factory sound bar and dash speakers, while the replacement tweeters offer clearer and brighter high notes. The subwoofer and amplifier mount neatly under the passenger seat for a clean, factory like professional installation.