Sundown Audio 8" 500W RMS Dual 4-Ohm SA Series Black Subwoofer, SA-8 V.3 D4

Local Pickup Only: Package {1} SKU #: JSR-050204251220Model #: SA-8 V.3 D4Approx. Weight: 22 lbs. Based Online ResearchApprox. Dimensions: (8 3/4” x 8 3/4” x 8”)   Things You Should Know: Two small imperfections on the top round material. See pictures for details.   As Advertised Online: 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