SA-15 D4 - Sundown Audio 15" 600W Dual 4-Ohm SA Series Subwoofer

RE (ohms): 7.75 FS (Hz): 36.95 Vas (L): 52.35 Qes: 0.85 Qms: 6.63 Qts: 0.75 Le (mH): 4.98 BL (NA): 25.87 Mms (Grams): 315 Cms (uM/N): 58.8 Sens (1w/1m): 86.68 Cutout Diameter: 14 1/8" Mounting Depth: 7 1/2" Overall Diameter w/ Gasket: 15 5/8" Displacement: 0.17ft^3 RMS: 600W Recommended Box Specs (Sealed): 2.5ft^3 (Yields F3 of 41Hz) Recommended Box Specs (Ported): 3.5ft^3 (Tune to 35Hz, Yields F3 of 28Hz) 19.0mm X-Max by 70% BL method one-way (38.0mm peak to peak) Thick black anodized aluminum voice coil formers for maximum strength and heat dissipation 4-layer copper high temperature voice coil windings with 45mm winding length Double layer permanently bonded high strength Nomex spider pack for maximum longevity and durability Thick flat tinsel lead wires tied down to the spider to prevent lead noise and breakage Custom tooled triple joint support ring Custom tooled frame spacer / ventilation ring High efficiency air-flow management integrated into the motor for maximum voice coil cooling Dual Aluminum Faraday rings for reduced inductance and inductive distortion (pole cap and magnet ID) Two-Year Warranty against defects in materials and workmanship