These JBL Bass Pro SL 8" Under Seat Subwoofer Systems are designed to provide low distortion and great bass performance. With a built-in class D amplifer, the BassPro SL produces minimal heat and doesn't need a lot of current from the car's electrical system. With the high-pass filters and limiters, flexible EQ adjustments and crossover control, the JBL Bass Pro SL delivers exceptional performance in a compact enclosure.