47QL7R12 Car Audio Quad L7R 12″ Subwoofer SPL 4800W Sub Box Enclosure NewKicker Surround Sound 47QL7R12 Car Subwoofer, Black, 12″ 2, 400 Watts RMS from Four L7R 12″ Woofers Birch plywood construction for high strength and reduced weight Kerf cut port tuned to 31 Hertz for optimal sound performance Pair of 2 Ohm terminals for easy connectivity Subwoofer Specifications: 12″ 2 Ohm series subwoofer Power handling: Peak: 1200 watts RMS: 600 watts Injection molded SoloKon woofer for enhanced durability Patented ribbed corners for improved performance UniPlate bumped back plate and pole piece for better heat dissipation Steel basket with spoke design for added strength Nickel plated speaker terminals for reliable connections Dual 2 ohm voice coils for versatile wiring options Large ceramic magnet for powerful bass response Top mount depth: 6 7/8″ Cutout diameter: 11 1/16″ Frequency response: 20 100Hz Sensitivity: 86 7dB