Sundown 8 Inch Subwoofer Sundown Audio SA-10 V.3 D4 SA Series 10" Component Subwoofer - Dual 4-Ohm Voice Coils Skar 12 Inch Subwoofers 4., 8 out of 5 stars Best Sellers Rank #92,224 in Electronics (See Top 100 in Electronics) Sundown Audio U-Series v. Enhanced Thermal Management: Coil temperature is regulated by a heavily smoothed high-velocity pole-vent, ten direct air-gap vents, and cast aluminum vent rings to effectively exchange air over the voice coil. 3 line and is built to withstand demanding music enjoyment and competition use. Recommended Port Area is 16 sq in. Uses a Black Aluminum former for superior heat dissipation. How to Choose the Best Sundown U 12 Inch Subwoofer for Total Q Factor (Qts): 0., 35, Sensitivity: 84., 9 dB @ 1w/1m, BL (NA): 29., 7, Mounting Depth: 7., 007 inches Venting: Coil temperature is regulated by a heavily smoothed high-velocity pole-vent, ten direct air-gap vents, and innovative cast aluminum vented frame spacer rings. Durable & High-Excursion Build: Features 30mm Xmax and an all-new cast aluminum frame with cast-aluminum surround clamps for enhanced stability. Sundown Audio SA-10 V.3 D2 10" Dual 2 Ohm Subwoofer - 1500W RMS / 3000W Peak - 22mm Xmax High-Excursion Car Sub - 8.11" Mount Depth - Low Distortion for Sealed/Ported Enclosures Add to cart X-10 V.2 D4 - Sundown Audio 10 1250W RMS X Rev 2 Series Subwoofer Recommended Enclosure: Optimized for 0., 5 cu ft sealed or 1., 0 cu ft ported enclosures. Advanced Motor Design: Utilizes a powerful double-stacked 8., 66 wide Y35 grade ferrite magnet system with a 5mm thick aluminum shorting ring to reduce static inductance., Motor has a 0., 6 long pole-extension for coil control. Includes double stitched surround and double-XL tinsel leads. High-Power 1500W RMS Rating: Features a 2., 36 long / 3 diameter 4-layer aluminum winding voice coil rated for 1500 Watts RMS. Durable Construction and Versatility The subwoofer includes cast Aluminum surround bolt-on rings, heavy duty cast basket, and spring loaded terminals that accept up to 8 gauge wire.