- Vented cast aluminum chassis for optimum strength and low compression - Geometrically reinforced aluminum cone for optimum piston operation and reduced break-up - Soft low damping rubber surround for improved transient response - Non-conducting fibre glass voice coil former for minimum damping - Extended copper sleeve on pole piece for low inductance and low distortion - CCAW voice coil for reduced moving mass - Long life silver lead wires - Vented pole piece for reduced compression