Ci160CSds Dual Stereo KEF’s Dual Stereo models are high-fidelity flush-mount speakers that recreates stereo, and are ideal for locations where there is only room for one speaker. Thanks to KEF's simple and ingenious screw down clamping system - with moisture-resistant fixings - you can place these speakers in environments such as bathrooms or under eaves. Nominal Impedance 8 Ohms Sensitivity 91dB (2.83V/ 1m) Frequency Response 50Hz - 20kHz (±6dB) open backed Crossover Response 3.2kHz Drive Units LF: 160mm (6.5in.)HF: 19mm (0.75in.) Product External Dimensions (H X W X D) 223 x 223 x 90.5 mm (8.78 x 8.78 x 3.56 in.) Cut-out Dimensions (H X W) 194 x 194 mm (7.64 x 7.64 in.) Without back can Mounting Thickness Ceiling Thickness (Maximum): 30mm (1.19 in.)Ceiling Thickness (Minimum): 3mm (0.12 in.) Mounting Depth From Surface 84.5mm (3.33in.) Without back can Optional Rough In Frame RIF160S Optional Rear Enclosure RNC160S Net Weight 1.80kg (4.0lbs.) Unit Measurement Piece Downloads ManualIndividual Information Spec. SheetArchitectural Speaker BrochureProduct Group Spec. SheetMinimum Cabinet Volume ChartCutout TemplateEASE GLL DATAProduct DrawingSelection And Setup GuideArchitectural Speaker Accessory Guide