Ventilated aerodynamic cast aluminum chassis for optimum strength and low compression. Proprietary cone material with EGYPTIAN PAPYRUS made in house. Fibers Soft, low-damping rubber surround for optimum transient response. Advanced BIMAX Spider for improved linearity, Powerful, optimized, low-distortion neodymium motor system. Non-conductive fiberglass voice coil bobbin for minimal damping Extended copper sleeve on the pole shoe for low inductance and reduced distortion. CCAW voice coil for reduced moving mass. Durable silver lead wires spaced 180 degrees for better stability. Ventilated pole piece and bobbin for reduced compression. High piston-to-chassis diameter ratio, gasket and bolt hole protrusions for reduced connection to the speaker cabinet.