With its ferrofluid-cooled aluminum dome neodymium tweeter, the coincident source 165mm (6 1/2") Uni-Q driver array creates a spacious and intricate sound image and bass extension from the large front-firing port accurately controlled to preserve the clarity of the midrange. The sophisticated crossovers are connected directly to the bi-wire terminals for optimum signal integrity. The KEF Q3 stereo speakers are featuring a frequency response of 45 Hz - 27 kHz, 120 watt peak power handling, an impedance level of 8 ohm and 91 dB sensitivity. Their width is 9.4 inches.