Uni-Q Two-way 130mm Round Features KEF’s patented Uni-Q driver array. The stylish Ci130QR's thin bezel and narrow rim allow for flawless visual integration into your ceiling. KEF's patented Uni-Q driver spreads sound over a wider area enabling you to use less speakers and still experience an even sound-stage. Model Ci130QR Nominal Impedance 8Ω Sensitivity (2.83V/ 1m) 87dB Frequency Response +/-6dB2pi/open-backed 45Hz - 34kHz Crossover frequency 3.8kHz Drive units LF: 130mm (5.25in.)MF: -HF: 19mm (0.75in.) Recommended amplifier power 10-100W Product external dimensions Diameter Ø: 193.4mm (7.61in.)Depth: 83mm (3.28in.) Cut-out dimension Diameter: 158mm (6.22in.) Mounting depth from surface Product only: 77.8mm (3.06in.) Optional rough in frame RIF130R