RMS 1000 watts Dual 2 or 4 ohm voice coils Vented magnetic gap Aluminum 2.75” voice coil former for superior heat dissipation Innovative high-velocity vented frame spacer ring Large aluminum Faraday ring for smooth acoustic response Patented high-strength cast aluminum frame High-temperature voice coil wire Spring-loaded terminals Stitched-on double “XL” tinsel lead wires A top-down improvement from previous models, the SA 18-inch sub features the largest motor in the series, now delivering over 35mm of mechanical excursion. The 2.75” coil punches way above its weight, outperforming most 3” coils without adding mass. The motor also features a large magnet shorting ring (faraday ring) to reduce distortion and deliver smoother response across the entire acoustic spectrum. The motor and coil setup is mated to an extremely robust double-layer spider with fully tied-on & doubled-up “XL” tinsel leads. A competition-grade paper cone and a strong foam surround were used to complete this masterpiece. Specifications T/S SPECS SAV2 18″ D2 SAV2 18″ D4 RE (Ohms) 3.97 6.06 FS (Hz) 29.051 31.868 VAS (L) 114.234 106.964 Qes 0.424 0.458 Qms 3.052 2.853 Qts 0.372 0.395 Le (mH) 3.6326 4.7903 BL (NA) 32.523 38.159 Mms (Grams) 619.174 549.519 Cms (uM/N) 48.474 45.389 Sens (dB @ 1w/1m) 90.1 90.7 Xmax 19mm 19mm Enclosure Specifications Sealed Enclosure 3.5 cu ft Ported Enclosure 4.5 cu ft Recommended Tuning 35Hz Recommended Port Area 64 sq in Displacement 0.2 cu ft Depth 10.125" Outside Diameter 18.62" Cut-Out 16.69″ Physical Dimensions Download Enclosure Designs .Zip File