Vented cast aluminum chassis for optimum strength and low compression. Proprietary cone material with natural fibers made in-house. Soft low damping rubber surround for transient response. Non-conducting fiber glass voice coil former for minimum damping. Extended copper sleeve on pole piece for low inductance and low distortion. Vented coil former. CCAW voice coil for reduced moving mass. Long life silver lead wires. Vented pole piece for reduced compression.