2014 Jeep Wrangler Unlimited The JL Audio speakers were a huge upgrade over the factory Jeep speakers. The entire Jeep speaker system was powered by this single chassis amplifier by Arc Audio. The JL Tw1 was a perfect fit for the Jeep enclosures. The client-supplied enclosures were constructed with fiberglass and wood. Once installed, the subwoofer enclosures were almost invisible. The unique shape of the underseat enclosure fit the floor perfectly. The seats were unbolted to install the enclosures. The client kept his factory radio but added a satellite tuner to it.