Patent-pending acoustic designs, together with state-of-the-art technologies from KEF's latest flagship Blade loudspeaker, provide the ultimate studio experience – even in the smallest of spaces. Model LS50 Design Two-way bass reflex Drive units Uni-Q driver array: HF: 25mm (1in.) vented aluminium dome LF/MF: 130mm (5.25in.) magnesium/aluminium alloy Frequency range (-6d - B) 47Hz - 45k - Hz Frequency response (±3d - B) 79Hz - 28k - Hz Crossover frequency 2.2k - Hz Amplifier requirements 25 - 100 W Sensitivity (2.83V/1m) 85d - B Harmonic distortion 2nd & 3rd harmonics (90d - B, 1m) <0.4% 175Hz-20k - Hz Maximum output 106d - B Nominal impedance 8Ω (min. 3.2Ω) Dimension (H x W x D) (with terminal) 302 x 200 x 278 mm (11.9 x 7.9 x 10.9 in.)