The in-wall CI9000 Reference 4 driver three-way 6.5-inch Uni-Q with ACE speaker system is an innovative new advance into custom installed loudspeakers. The 165-millimeter (6.5-inch) Uni-Q driver array brings out the full emotional depth and texture of vocals, whether sung, shouted, spoken or whispered - hardly surprising, since it"s exactly the same unit as you"ll find on KEF"s XQ series. On either side, a matching pair of long throw bass drivers with ultra-low distortion motors for low frequency response that"s as lucid as it is gutsy - and thanks to KEF"s acoustic compliance enhancement (ACE) technology, what you actually hear is a level of bass extension that"s normally only obtainable with much larger speakers. The CI9000 comes with two grille options: The pictured black cloth covered grille and a white overhanging grille. A grille for painting or covering is also available.