The JBL Arena is the best subwoofer in its class that money can buy. Nothing else even comes close. Leveraging patented Selectable Smart Impedance (SSI) technology and features from JBL's Luxury Audio division where subwoofers have fill rooms far larger than a car, the 10" Arena takes a completely new approach to car audio which uses light and agile opposed 2.5-inch voice coils in magnetic gap to provide completely linear control of cone excursion all the way up to Xmax. Symmetrical Field Geometry™ design ensures linear cone travel and low distortion at virtually any output level. Surrounding the proprietary motor design are other high-tech materials, including a cast-aluminum frame,concave cone, a nitrile butadiene rubber (NBR) one-piece surround, gold-plated speaker-terminal binding posts, progressive spider and vented pole piece. This subwoofer handles an amazing 2,100 watts peak power (700 watts RMS), and all of its parts work in harmony to cool the voice coils for maximum output.