CFS PF35N drivers are optimized using FEA to give a rising HF response. This results in a noticeably wider dispersion characteristic to higher frequencies than conventional speakers of this size. Chassis are purpose designed for maximum free air movement, while stiff and treated paper cones remain rigid to higher frequencies, delivering a smoother response in the critical listening band. Half roll polycotton surrounds enable greater excursion and lower responance frequeancy for small diameter cones. they also provide damping of unwanted resonances and sustained centring control at exatremes of excursion.