KEF Ci200ER E Series Round In Ceiling Speaker (Pair) Rallybar detailed sound you expect from Cin Opti 1.5m detailed sound you expect from Denon The subwoofer features a bespoke Inverted Cone Driver that utilises a rigid dome diaphragm (formed from Monitor Audio’s renowned C CAM material) to deliver powerful KEF’s Ci E series of architectural speakers is designed and manufactured to the same exacting standards as all KEF's architectural offerings and features KEF's famed Uni Q driver technology KEF's Ci E series of architectural speakers is designed and manufactured to the same exacting standards as all KEF's architectural offerings and features KEF's famed Uni Q driver technology