Sundown Audio SA-8 V.3 - 500W 8"

SA-8 V.3- Sundown Audio 8 inch 500W RMS Dual 4-OhmSeries Subwoofer. Specifications:Resistance (Re): 6.0 & 3A9; | Resonance Frequency (Fs): 40.0| Equivalent Volume (Vas): 7.17 L | Electrical Q Factor (Qes): 0.392 | Mechanical Q Factor (Qms): 4.310 | Total Q Factor (Qts): 0.360 | Force Factor (BL): 22.06| Moving Mass (incl. Air Load) (Mms): 126.6 g | Suspension Compliance (Cms): 125 & 3BC;m/N | Sensitivity: 82.711w / 1m. Box Recommendations: Sealed Enclosure Suggestion: Not Recommended | Ported Enclosure Suggestion: 0.5 - 0.75 cu. ft.. Hz | Displacement: 0.08 cu. ft. | Depth: 6.625|Outside Diameter: 8.375| Cutout: 7.375 in