Cerwin-Vega HS104D Hed Dvc Shallow Subwoofer (10", 4 Ohm) Dual Voice Coil Stamped-steel Slim-mount Frame With Encapsulated Motor Vented Motor Structure For Optimal Thermal Heat Dissipation Polycotton Spider With Spaced, Woven-in Tinsel Wires Oversized Parabolic Dust cap For Extreme Rigidity