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These speakers are small but WOW, what beautiful sound. I use them as the side surround in a 7.1 system. The rest of the speakers are the kef t105 surround system driven by a denon receiver. These speakers blend beautifully into a system that's the best I've heard and it's in my livingroom. I'm so excited. The ci100qrs sound great isolated so whatever your intended use these are great. One speaker fills a 20 by 30 room with near flawless sound. The low end isn't fully realized but it's a 4" speaker and it's not bad.
Installing these is a breeze but without instructions you should know the clips go in flat side against the speaker. When inserting into the ceiling the first clip protrusion should pass through the hole while the 2nd should catch the edge and fold the top down to clamp as you push the speaker all the way in. The speaker does have some depth so make sure you have 6 or seven inches.
For a speaker like the CI100QR in-ceiling 4-inch two-way Uni-Q with integrated back box, KEF believes that the quality of a speaker is no less important just because it's out of sight - in fact with ceiling-mounted units it can be more so. Designed to smoothly integrate and architecturally match with existing down lighting sharing the same size bezel KEF's trademark Uni-Q technology has a decisive performance advantage in these applications because each point source driver array evenly disperses the sound ensuring a smooth frequency response over a large area to create a spacious three-dimensional soundscape with genuine texture and depth. With a two-way 100-millimeter Uni-Q driver, the Ci100QR is as satisfyingly musical to hear as it is neat in appearance. As a latest addition to the KEF Uni-Q custom installation series, the Ci100QR is built for flush mounting into walls and ceilings. Providing a compact solution to the problem of hi-fi quality sound from an in-wall/ceiling speaker the Ci100QR consists of a polypropylene cone LF driver with the HF unit mounted at the acoustic centre of the LF unit. The bezel and grill can be painted to match the interior decor.