RMS 400 watts 4 ohm voice coil Made for extremely deep bass Triple-stacked magnet 3” voice coil Hyper-extended pole  Vented top plate Built to order Designed with an extended pole piece and an incredible four inches of peak-to-peak excursion, the X v.2 is engineered for ultra-deep bass and high power handling. Engineered to set a new standard in the low-frequency/small-ported-box subwoofer category, the X Series can also work in up to a 50% larger enclosure if you desire even more low-end extension. The X v.2 series differentiates itself with its incredibly linear suspension, ensuring the lowest level of bass extension in a small enclosure while maintaining extremely low levels of distortion. Notably, the v.2 series features a much larger motor structure (220mm vs. 190mm on the V.1 series), improved motor ventilation, and an all-new Mega-Roll v.2 surround, providing a more linear and rugged update to the world-famous Mega-Roll v.1 surround design. Specifications RE (Ohms) 2.9 FS (Hz) 55.778 VAS (L) 1.657 Qes 0.619 Qms 9.255 Qts 0.581 Le (mH) 0.60 BL (NA) 11.702 Mms (Grams) 83.452 Cms (uM/N) 97.561 Sens (dB @ 1w/1m) 78.5db Xmax 16mm T/S SPECS X 6.5″ S4 Enclosure Specifications X 6.5″ S4 Sealed Enclosure .15 cu. ft.  Ported Enclosure 0.25cuft – 0.4 cu. ft. NET Recommended Tuning 35-45hz Recommended Port Area 3.5-6 sq in Displacement 0.03 cu ft Depth Outside Diam. Cutout Physical Dimensions Download