Sundown Audio U-Series 6.5" v.1 Subwoofer

RMS 400 watts Dual 2 or 4 ohm voice coils Optimized for small ported enclosures Aluminum 1.75” voice coil former for superior heat dissipation High-temperature copper voice coil Double stitched surround Heavy-duty cast basket Spring-loaded terminals accept up to 8-gauge wire Stitched-on heavy-duty tinsel leads Solid pole with vent channels and aluminum shorting ring cap Rear gap-venting Top-Plate Cooling Channels Perfect for high-power underseat enclosures and designed to be at home in the competition lanes or playing your favorite tunes, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9” wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are also used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. An all-new, substantially thicker custom aluminum frame was designed specifically for the U Series, and equipped with heat-dissipation ribs. The v.2 motor also features an extended pole piece to keep the coil controlled under high stress! Specifications RE (Ohms) 4.0586 6.6274 FS (Hz) 41.9533 38.6925 VAS (L) 2.9053 3.7701 Qes 0.5238 0.5005 Qms 8.5834 7.2470 Qts 0.4937 0.4681 Le (mH) 4.0112 5.5892 BL (NA) 16.7428 20.0082 Mms (Grams) 137.2546 124.3518 Cms (uM/N) 104.8528 136.0613 Sens (dB @ 1w/1m) 77.8706 78.1460 Xmax 19mm 19mm T/S SPECS U-6.5SW" D2 U-6.5SW" D4 Enclosure Specifications Ported Enclosure Size: .25-.35 cu. ft. net Port Area: 4-5 sq. in. Port Tuning: 35hz -40hz Sealed Enclosure Size: 0.125-0.2 cu. ft. net Displacement: .04 cu. ft. Depth: 5.71" Outside Diameter: 7.17" Cutout: 5.94" Physical Dimensions