The KICKER 52L7XS152 is a 15 inch SoloXS L7XS square subwoofer built for extreme excursion, ultra deep bass, and very high output. This 2 ohm DVC model is designed for serious bass systems that need more power, more stroke, and more Xmax than typical high performance subwoofers. Rated for 1500 to 3000 watts RMS, the 52L7XS152 uses a massive ferrite motor, 3 inch aluminum voice coil former, extra large dual spider suspension, double pressed pulp cone, and proprietary NBR surround. With 43.1 mm of Xmax and a 705 oz magnet assembly, it is built for heavy low frequency output while still aiming to remain musical as well as loud. Forced Air Cooling helps the subwoofer run cooler under hard use, and the field replaceable recone system allows faster service with no glue required. A max cooling cast aluminum basket, custom rubber magnet boot, single 8 AWG push terminal, dual 4 AWG terminal block, and dual high strand tinsel leads complete the build. KICKER recommends a 5.0 cubic foot vented enclosure tuned to 30 Hz with a 4.25 x 16.5 inch port opening and 34.75 inch port length. Spec Table: Model: KICKER 52L7XS152 Series: SoloXS L7XS Size: 15 inch Configuration: 2 Ohm DVC Recommended Amplifier Power RMS: 1500 to 3000 Watts Frequency Response: 18 to 100 Hz Xmax: 1.71 inch or 43.1 mm Mounting Cutout: 13 3 4 inch Mounting Depth: 11 9 16 inch Recommended Vented Box Volume: 5.0 cu ft Port Opening: 4.25 x 16.5 inch Port Length: 34.75 inch Vented Enclosure Tuning Frequency: 30 Hz