The remarkable Q Series bookshelf speakers excel when space is limited. Featuring the signature KEF Uni-Q driver array with Computational Fluid Dynamics (CFD) port design, the Q150s deliver detailed natural sound with high clarity and tight bass. At the heart of the evolved Q Series is the Uni-Q driver array. KEFs signature innovation places the tweeter in the acoustic center of the midrange cone, bringing the acoustic ideal of a single point source closer than ever to realisation. The result is a more detailed, more accurate three-dimensional sound image, which is dispersed more evenly throughout the room than is possible with a conventional speaker. Uni-Qs ultra-wide dispersion is further enhanced by KEFs tangerine waveguide over the tweeter dome. SPECIFICATIONS: Recommended Power (W): 10-100 Product Dimensions (mm): 303 x 180 x 278 Impedance (Ohm): 8 Frequency Responce (Hz): 51Hz - 28kHz Sensitivity (dB, 2.8V/1m): 86dB