This VEGA PRO series exceptional 15-inch size woofer offers value and performance there is nothing close to! VEGA PRO * Proprietary Stamped Cast Basket Design * Optimized High Power Double-Stacked Motor Structure * Vented Pole Piece and Voice Coil Gap for Maximum Cooling * Proprietary Horizontal Mounted Terminal with Integrated Impedance Selector * High Power Stitched Tensile Leads Embedded in Double Progressive Spiders * Black Santoprene Double Stitched Surround for Ultimate Reliability * Power Handling: 900W / 1800W. * Sensitivity (dB @ 1W 1M): 88dB. * Mounting Diameter: 13.62" (346mm). * Mounting Depth: 7.36" (186mm). * Suggested Sealed Enclosure Volume: 2.5 ft3 70.79 litres. * Vented Enclosure Volume: 3.0 ft3 84.95 litres. * Vent Dimensions: 2.5" x 16.5" x 23"/63.5mm x 419.1mm x 584.2mm.