DS18 BD-X124D Bl4ck Di4mond Series 1200 Watts Max 12-Inch Luxury Subwoofer Bass 12" Inches 500 Watts RMS Subwoofer, 1,200 Watts Max Power. 90dB Sensitivity and 40-4.1KHz Frequency. 5.7" Mounting Depth with a 2" 4+4-Ohms Voice Coil 85 Oz. Magnet. Optimum Sealed Enclosure Ft. 3/L: 1.22FT/34.8L 12.44" Overall Diameter, 11.10" Baffle Cutout Diameter, 4+4 Ohms Minimum Impedances, 2" Voice Coil Diameter Thiele & Small Parameters: FS: 40Hz. Re: 3.2 Ohms + 3.2 Ohms. Qes: 1.604. Qms: 6.022. Qts: 1.267. Vas: 85.411L