Unprecedented value and performance Heard but not seen, 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. Heard but not seen, with unprecedented value and performance, 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 Uni-Q driver enables the mid-range and tweeter to act as a single point source. This patented technology allows the listener to sit anywhere in the room and still enjoy KEF's world-renowned sound and clarity without having to be positioned in the narrow "sweet-spot" found with conventional speaker designs. The Ci-E Series also features KEF's Ultra-Thin Bezel (UTB) technology which offers the thinnest possible visible rim around the speaker assembly. The bezel and grill can be painted to match the interior décor. The speakers in the Ci-E Series, are manufactured to Weather Resistant Construction standards: The grilles are coated via a proprietary process, the speakers include moisture-resistant terminations and finish materials, and the plastics are UV protected, allowing you to safely use these speakers in applications such as bathroom and kitchen. Nomimal Impedance 8 Ohms Sensitivity 89dB (2.83V/ 1m) Frequency Response 52Hz - 20kHz (+/-6dB) open-backed Crossover Frequencies 2.8kHz Drive Units LF: 160mm (6.5in.) HF: 16mm (0.6in.) Recommended Amplifier Power 10-100W Product External Dimensions Diameter : 234.6mm (9.24in.) Depth : 88.7mm (3.49in.) Cut-Out Dimensions Diameter : 196mm (7.71in.) Mounting Thickness Ceiling Thickness (Maximum): 36mm (1.42 in.) Ceiling Thickness (Minimum): 6mm (0.24 in.) Mounting Depth From Surface 85.2mm (3.35in.) Optional Rough In Frame RIF160R Optional Rear Enclosure RNC160R Net Weight 1.4kg (3.1lbs) Unit Measurement Piece Document Download ManualIndividual Information Spec. SheetArchitectural Speaker BrochureProduct Group Spec. SheetMinimum Cabinet Volume ChartCutout TemplateEASE GLL DATAProduct DrawingSelection And Setup GuideArchitectural Speaker Accessory Guide KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. Please visit our Ci Software Download page for more details.