- Soft low damping rubber surround for improved transient response - Geometrically reinforced aluminum cone for improved break-up control - Shorting ring in motor system for reduced distortion - Vented pole piece for reduced compression - Vented cast aluminum chassis for optimum strength and low compression - Shallow design - Non-conducting fibre glass voice coil former for minimum damping - CCAW voice coil for reduced moving mass - Long life silver lead wires