The KICKER 52L7XS122 is a 12 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 52L7XS122 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. KICKER also includes Forced Air Cooling to help the subwoofer run cooler and last longer under demanding use. Serviceability is a major part of the design, with a field replaceable pre assembled recone system that uses a surround compression system, bolt on spider landing, and alignment pins for fast no glue replacement. KICKER lists a recommended 3.0 cubic foot vented box tuned to 31 Hz, with a 3.5 x 13 inch port opening and 36.5 inch port length. Spec Table: Model: KICKER 52L7XS122 Series: SoloXS L7XS Size: 12 inch Configuration: 2 Ohm DVC Recommended Amplifier Power RMS: 1500 to 3000 Watts Frequency Response: 20 to 100 Hz Magnet Diameter: 9.85 inch Total Magnet Weight: 705 oz Voice Coil Diameter: 3 inch Voice Coil Winding Width: 3.4 inch Top Plate Thickness: 0.8 inch Xmax: 1.71 inch or 43.1 mm Mounting Cutout: 11 1/16 inch Mounting Depth: 10 1/8 inch Recommended Vented Box Volume: 3.0 cu ft Port Opening: 3.5 x 13 inch Port Length: 36.5 inch Vented Enclosure Tuning Frequency: 31 Hz Forced Air Cooling: Yes Field Replaceable Recone Kit: Yes Cone Material: Double Pressed Pulp Cone Surround Material: Proprietary NBR Terminals: Single 8 AWG Push Terminal and Dual 4 AWG Terminal Block