Enclosed Subwoofer System with Single 10W0v3-4 Subwoofer, Dark Gray Carpet 300 W, 4 ? - Ported Enclosure This powerful slot-ported BassWedge subwoofer system delivers awesome output at an unsurpassed value. The slot-port runs along the bottom of the enclosure and fires on the same plane as the woofer to produce excellent extension and response smoothness. The port mouth is flared to minimize air-flow noises. The ultra-versatile BassWedge shape has extended sides so that it can be placed with the woofer firing out or straight down, off the floor of the vehicle. The shape works equally well in forward or rear-firing installations. This gives you plenty of options for tweaking the loading of the enclosure into your vehicle. This subwoofer system is shipped wired, loaded and ready to connect via a push-button terminal. Finish: Dark gray, high-grade automotive carpet with "JL AUDIO" embroidery on the top edge and "Slot-Ported BassWedge" embroidered on the port mouth. Construction: MDF Recommended amplifier power: 75 - 300W Nominal Impedance: 4 ? Continuous Power Handling RMS 300 W System Nominal Impedance 4 ? Enclosure Type Slot-ported Finish Gray carpet Grille Included No External Width W 15.51 in / 394 mm External Height H 13.77 in / 350 mm External Depth D1 17.38 in / 441 mm External Top Surface Depth D2 14 in / 356 mm Net Weight 29 lb / 13.15 kg Dynamic Motor Analysis - DMA Optimized Motor Summary: JL Audio's proprietary Dynamic Motor Analysis system is a powerful suite of FEA-based modeling systems, first developed by JL Audio in 1997 and refined over the years to scientifically address the issue of speaker motor linearity. This leads to vastly reduced distortion and faithfully reproduced transients... or put simply: tight, clean, articulate bass. Detailed Information: Since 1997, JL Audio has been at the forefront of Finite Element Analysis-based modeling of loudspeaker motors and suspensions. This research is aimed at decoding what we refer to as the "