High-density, cast aluminum alloy deep dawn basket - Ridged, two-part treated paper/fiberglass laminated woofer cone - FEA optimized high-power motor with vented pole piece - Copper anodized aluminum elevated radiating heat sink - Impedance selection via high-power terminal - 3 “ high-temp copper voice coil on treated black high-strength aluminum former - Klippel® DA optimized motor and suspension symmetry.