SB Acoustics speaker SATORI MR16P-4. Vented aerodynamic cast aluminium chassis for optimum strength and low compression. Proprietary cone material with EGYPTIAN PAPYRUS fibres made in-house. Soft low damping rubber surround for optimum transient response. Advanced BIMAX spider for improved linearity. Powerful optimized low distortion neodymium motor system. Non-conducting fibre glass voice coil former for minimum damping. Extended copper sleeve on pole piece for low inductance and reduced distortion. CCAW voice coil for reduced moving mass. Long life silver lead wires attached 180 apart for improved stability. Vented pole piece for reduced compression. High piston to chassis diameter ratio. Gasket and bolt hole protrusions for reduced coupling to speaker cabinet.