PAIR OF E-12 V.3 D4 - Sundown Audio 12" 500W RMS Dual 4-Ohm EV.3 Series Subwoofers RMS Power = 500-watts | Xmax = 14mm one-way by 70% BL | Vented magnetic gap Vented pole piece with optimized geometry | Black Aluminum 2.5 voice coil former for superior heat dissipation | High Temperature 4-Layer copper voice coil wire Spring Loaded Terminals | Stitched-On Mini-XL Tinsel Leads to prevent fatigue and failure Box Recommendations: Sealed: 1.0 ft^3 | Ported: 1.75 ft^3 | Displacement: 0.12 ft^3 | Depth: 6 1/2" | Outside Diameter: 12 1/4" | Cut-Out: 11 1/8" | Recommended Tuning: 32hz | Recommended Port Area: 28 in^2