The DS18 EXL-X15.4D Competition Grade subwoofer is one of the top of the line subwoofers in the market today. The EXL-X15.4D went through copious amounts of R&D in order to perfect their look, power, and versatility. There are no subwoofers that can compare to the EXL-X15.4D sophistication, beauty, and precision of these. Features: Red Color Aluminum Basket with Large Foam Edge and Paper with Glass Fiber Cone 210 Oz High-Strength Double Ferrite Magnet, 2-Layer Conex Spider, and 2.5" Black Aluminum 4-Layer Voice Coil Specifications: Rms Power: 1,250 Watts Peak Power: 2,500 Watts Subwoofer Size: 15" Voice Coil: 2.5" Black Aluminum Impedance: Dual 4-ohm Frequency Response: 25Hz – 1.5KHz Sensitivity: 92dB Measurements: Baffle Cut Out: 13.98" Overall Diameter: 15.6" Mounting Depth: 8.07" DBs Enclosure Recommendations Sealed: 1.75 cu-ft. Ported: 2.35 - 3.5 cu-ft. Tuned to 32Hz