Kef CI100QS 4″ Uni-Q In-Wall or In-Ceiling Speakers (Pair)



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For music or movies, your installation needs to deliver the flawlessly accurate three-dimensional sound you’d expect from the best conventional speakers – startlingly clear and breathtakingly realistic. And that’s exactly what our Ci range does.

KEF’s passion for acoustic excellence shines through in every model. By combining radically innovative engineering with sophisticated design technologies, the Ci range achieves what used to be thought impossible: compact custom installation speakers that sound as compelling as an audiophile quality hi-fi system, no matter where you sit.

With impeccable cosmetics, there’s a KEF Ci model for every application, from tiny ceiling speakers the size of downlights to motorised super-premium home theatre speakers that glide into place at the touch of a button. All are ruggedised for harsh environments such as bathrooms or boats.

All KEF speakers are sonically-matched, so any combination you specify for different listening areas will have the same tonal colour for a perfectly consistent soundstage. Fast, easy installation has always been valued by Ci Series installers. With only a few simple steps and KEF’s unique design features, Ci speakers can be fitted quickly, with no special skills. Once the hole is cut and the cable run, the area is soon flooded with great high definition sound.


The popular Soundlight Series is yet another major innovation form KEF. When installed, Soundlight speakers are so tiny that they blend in with halogen light fixtures yet will amaze you with their astonishing performance, thanks to KEF’s patented Uni-Q’s exceptionally wide dispersion. Fast and Easy to Install KEF’s Ci loudspeaker design makes them so quick and easy to install that once the wire is run and the hole is cut in your wall or ceiling you can be listening to music in less than two minutes.


Model Ci100QS

Nominal Impedance

Sensitivity (2.83V/ 1m) 88dB

Frequency response (±6dB) open-backed 80Hz – 27kHz

Crossover frequency 3kHz

Drive units LF HF 100mm (4in.) 19mm (0.75in.)

Recommended Amplifier Power 10 – 50 W

Product external dimensions (H x W x D) 127 x 127 x 76 mm (5.0 x 5.0 x 2.99 in.)

Cut-out dimensions (H x W) (With back can) (Without back can) 112 x 112 mm (4.41 x 4.41 in.)

Net Weight 0.67kg (1.48lbs.)

Mounting depth from surface (Without back can) 72mm (2.83in.)

Optional rough in frame RIF100S

Optional rear enclosure RNC100S

KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.
0.6700 kg




Frequency Response

80Hz – 27kHz

Height (mm)



4 Ohms


Kef CI100QS

power handling

50 Watts


88 dB


In-Wall or In-Ceiling Speaker

Width (mm)


custom speaker type

In-Wall Speakers, In-Ceiling Speakers

bass driver

4” Mid/Bass Driver


50mm to 100mm

speaker design

Powered Speakers

multi room audio visual

Custom Speakers

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Excellence in sound. KEF exists to fill rooms with music, to move souls with truly authentic soundscapes.