RE Audio XXX15-v2-4 15" Cast Frame DVC Subwoofer Driver 4+4 Ohm RE Audio&apos;s top-of-the-line subwoofer series Vented Magnet System for extreme 2,000 watt RMS power handling Class-leading 54 mm Xmax for over 4&quot; of total travel! Rubber surround and dual progressive spiders