RMS 500 watts Dual 2 or 4 ohm voice coils Optimized for ported enclosures Class-leading 14mm Xmax Double-stacked magnet Vented magnetic gap & pole piece for superior cooling High strength stamped steel frame High temp 4-layer copper voice coil wire High-quality push terminals Stitched-on Mini-XL tinsel leads Through relentless research in our North Carolina Headquarters, Sundown optimized a 2.5” voice coil and a truly unique motor design to get the deepest possible bass response out of a 10” subwoofer. The subwoofer showcases a distinctive motor design, featuring a heavily vented magnetic gap and solid pole piece, enabling exceptional thermal power handling. The spider itself is a high strength poly-cotton blend designed to handle the full capacity of the motor. To provide an additional level of ruggedness the spider is bolted down and glued to the frame. Its motor geometry allows for a remarkable 14mm one-way linear Xmax, delivering excursion equivalent to far larger cones. Specifications T/S Specs E v.4 12" D2 E v.4 12" D4 RE (Ohms) 4.030 6.130 FS (Hz) 28.480 28.373 VAS (L) 53.059 54.292 Qes 0.509 0.570 Qms 5.249 3.542 Qts 0.464 0.491 BL (NA) 17.576 20.249 Mms (Grams) 217.987 213.033 Cms (mm/N) 143.258 146.589 Sens (dB @ 1w/1m) 85.7 85.3   Enclosure Specs Ported Enclosure Size: 1.75 cu. ft. net Port Area: 26 sq. in. Port Tuning: 35 Hz Sealed Enclosure Not Recommended Displacement: 0.12 cu. ft.  Depth:  6.50" Outside Diameter: 12.250" Cutout: 11.125" Physical Dimensions