- Proprietary cone material with natural fibres made in-house - Shortened voice coil optimized for pure midrange reproduction - High damping Butyl rubber surround for non-resonant sound character - Vented pole piece for reduced compression - Vented cast aluminium chassis for optimum strength and low compression - CCAW voice coil for reduced moving mass - Long life silver lead wires - Non-conducting fibre glass coil former for minimum damping