NS-15 V.3 D2 - Sundown Audio 15" 2500W RMS Dual 2-Ohm Nightshade V3 Series Subwoofer NS V.3 15" D2 - Sundown Audio 15" 2500 Watt RMS Dual 2-Ohm Nightshade V.3 Series Subwoofer Outside Diameter: 15.51" Cut-Out: 13.83" Depth: 13.000" Recommended Port Area: 60 in^2