Dual 2 ohm 15″ Subwoofer 500W – 1,500W optimal power range 3 inch voice coil Triple stack 225oz motor 23.5mm Xmax Double high current tinsel leads Nomex spider Designed for use in small vented enclosures. Engineered in the USA. Also available in dual 4 ohm Description The 4000 series 15 employs a finely-tuned balance of damping and extensive motor force to achieve very high efficiency, offering exceptional versatility and unmatched performance in a variety of real-world functions. Fs 32.270 HzQms 5.779Vas 43.730 litersCms 0.051 mm/NMms 471.000 gRms 16.705 kg/sDia 314.400 mmSd 776.345 sq cm Qes 0.527Re 4.298 ohmsLe 2.738 mHZ 5.158 ohmsBL 27.897 TmBL^2/Re 181.075 N^2/W Qts 0.483no 0.269 %SPL 86.439 dBEBP 61.187 Xmax 23.5 mm Nominal Diameter 15inOverall Diameter 15.6in / 396mmMounting Hole Diameter 14.12in / 358.65mmMotor Outer Diameter 7.72in / 196mmMounting Depth 895in / 227.5mmDriver Displacement 0.157 cu ft / 4.47 l Minimum Sealed Volume N/AMinimum Vented Volume 1.82 cu ft / l net*