RMS 600 watts Dual 2 or 4 ohm voice coils Optimized for small, sealed enclosures Lightweight Neodymium motor Computer-optimized foam “w” surround Two-inch 8-layer copper voice coil Large aluminum Faraday ring for smooth acoustic response Patented high strength cast aluminum frame Low distortion motor construction High-temperature voice coil wire Spring-loaded terminals Stitched-on tinsel lead wires The SD-4 series truly is a world-class sound quality woofer with low mounting depth, small box requirements, yet extraordinarily high power handling. It's the ideal choice for anyone seeking a high-quality, low-mounting-depth subwoofer that performs hammers in small enclosures. With enhanced mechanical durability and superb sound quality, you get the perfect marriage of form and function.   Specifications RE (Ohms) 3.90 7.34 FS (Hz) 27.4407 27.1207 VAS (L) 36.1729 39.9739 Qes 0.5687 0.6299 Qms 4.9232 4.6994 Qts 0.5098 0.5554 Le (mH) 5.8856 9.1167 BL (NA) 14.4713 18.0508 Mms (Grams) 177.0601 164.0278 Cms (uM/N) 189.9892 209.9529 Sens (dB @ 1w/1m) 82.93 82.77 Xmax 14.5mm 14.5mm T/S SPECS SD-4 10″ D2 SD-4 10″ D4 Enclosure Specifications Sealed Enclosure 0.5-0.75 cu ft Ported Enclosure Not Recommended Recommended Tuning N/A Recommended Port Area N/A Displacement 0.09 cu ft Depth 4.43″ Outside Diameter 10.86" Cut-Out 9.20" Physical Dimensions Download