KEF Ci100QS 4″ In-Wall Speaker



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Uni-Q 2 Way 100mm Square

The KEF Ci100QS – quality that is quite literally out of sight! Purpose-built for flush mounting into walls and ceilings, the Ci100QS delivers KEF’s renowned audio quality as unobtrusively as possible. Part of our Soundlight Series of unobtrusive architectural speakers, the Ci100QS is diminutive in size but not in performance!



Featuring KEF’s sophisticated ‘sit anywhere’ Uni-Q driver array, which places the tweeter in the acoustic centre of the bass/midrange cone, this allows both the tweeter and woofer to act as a single point source that disperses the sound widely and evenly throughout the room. Together with the discreet Ultra Thin Bezel (UTB) design, offering the slimmest possible visible rim around the speaker, the Ci-Q Series range gives you tremendous freedom to position the speakers where you please.

Key features of the KEF Ci100QS:

  • UTB™ Ultra Thin Bezel
  • 100mm (4in.) Uni-Q driver array
  • 19mm (0.75in.) Aluminium dome tweeter and ‘tangerine’ waveguide
  • Gold plated spring loaded binding posts
Colour White
Nominal Impedance
4 Ohms
88dB (2.83V/ 1m)
Frequency Response
80 - 27kHz (±6dB) 2pi/open-backed
Crossover Frequencies 3kHz
Drive Units LF: 100mm (4in.)
HF: 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 : 112 x 112 mm (4.41 x 4.41 in.)
Mounting Thickness Ceiling Thickness (Maximum): 24mm (0.95 in.)
Ceiling Thickness (Minimum): 6mm (0.24 in.)
Optional Rough In Frame
Optional Rear Enclosure RNC100S
Mounting Depth From Surface
Without back can : 72mm (2.83in.)
Net Weight
0.67kg (1.48lbs.)

Additional information

Weight 1 kg
Dimensions 25 × 25 × 20 cm