Sundown Audio SA 6.5” Subwoofer SA 6.5” Subwoofer RMS 200 watts Dual 2 or 4 ohm voice coils Large aluminum Faraday ring for smooth acoustic response High-temperature voice coil wire Spring-loaded terminals Integrated vent channels for enhanced cooling The SA-6.5SW was created to ...Sundown Audio SA 6.5” Subwoofer SA 6.5” Subwoofer RMS 200 watts Dual 2 or 4 ohm voice coils Large aluminum Faraday ring for smooth acoustic response High-temperature voice coil wire Spring-loaded terminals Integrated vent channels for enhanced cooling The SA-6.5SW was created to achieve extremely high performance with less than 4” of mounting depth. Sundown uses a solid-pole design, allowing the back plate to rest against the back wall of the enclosure reducing the mounting depth requirements even more. Twenty millimeters of mechanical excursion means surprisingly deep bass out of this mighty 6.5” sub! T/S SPECS SA 6.5′′ D2 SA 6.5′′ D4 RE (Ohms) 4.0 7.1 FS (Hz) 48.9 51.8 VAS (L) 4.1 3.6 Qes 0.50 0.54 Qms 4.82 4.65 Qts 0.46 0.49 Le (mH) 1.69 2.45 BL (NA) 13.5 17.9 Mms (Grams) 74.8 75.6 Cms (uM/N) 0.14 0.12 Sens (dB @ 1w/1m) 81.6 81.5 SA 6.5" Sealed Enclosure 0.15 cu ft Ported Enclosure 0.3 cu ft Recommended Tuning 40Hz Recommended Port Area 4 sq in Displacement Depth 3.79" Outside Diameter 7.16" Cut-Out 5.93"