This customer wanted more Bass! The customer previously had a JL Audio Stealth and JL Amp Installed in this 2018 GMC Yukon. It sounded good but the customer wanted more bass. We added a JL Audio 600 watt Amp and a custom built ported enclosure in the rear of the vehicle storage area. We replaced the factor storage box and mimicked the original appearance. We produced much more bass and its sounds fantastic.