Architectural Speakers


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Cavity Radiation Control (CRC)

The latest patent-pending technology developed by the KEF Engineering team in the UK; Cavity Radiation Control (CRC) is a unique open-back midrange with acoustically absorptive foam design that eliminates midrange issues including frequency response dips of up to 30dB in magnitude, found in typical coaxially arranged three-way designs. With CRC, Ci250RRM-THX delivers the highest midrange acoustic realism among three-way coaxial loudspeakers to date.

Low Diffraction LF Aperture 

Ci250RRM-THX features Low Diffraction LF Aperture, a carefully profiled, smoothed housing design with an outer acoustically absorptive foam ring that reduces resonance and diffraction. As a result, it delivers exceptional MF/HF performance while preserving a tremendous bass output.

Uni-Q®Sit anywhere, hear every detail

Uni-Q technology is the building block of KEF signature sound. Designed to perform at its best in Ci250RRM-THX, the remarkable 12th generation Uni-Q driver array acts as a single point source, dispersing sound more evenly allowing everyone sitting at different spots in the room to experience the same natural detailed sound.


MAT™Absorb 99% of the unwanted sound

The Ci250RRM-THX is the first architectural speaker that benefits from our acoustic innovation: Metamaterial Absorption Technology (MAT™).  MAT is a highly complex maze-like structure that absorbs 99% of the unwanted sound from the rear of the tweeter, delivering a more crisp, natural treble performance.

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THX certified logo.png
Ci250RRM-THX delivers ultra-high performance with true theatre sound quality for large theatres and living rooms and it is certified to THX® Ultra. A deep understanding of the filmmaking process and surround sound is at the very heart of every THX® certified speaker system. Engineered with design characteristics of professional studio speakers, THX® recreates the tonal balance of the filmmaker's final mix in your home theatre or living room. The results? Action sequences are impactful, and dialogue-driven moments are natural and engaging.

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The Details


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Nominal Impedance
8 Ohms
Sensitivity (2.83V/1m)
Frequency Response (±6dB) Open-backed
28Hz - 20kHz
Frequency Range (-10dB)
20Hz - 45kHz
Nominal Coverage (Degrees)
Crossover Frequencies
540Hz, 2.6kHz
Drive Units
LF: 250mm (10in.)
MF: 100mm (4in.) Uni-Q
HF: 19mm (0.75in.) vented aluminium dome with Metamaterial Absorption Technology1
Recommended Amplifier Power
50 - 250W
Recommended High-pass Filter (Hz)
30 - 60Hz
Product External Dimension
Diameter Ø: 346mm (13.62in.)
Depth: 175mm (6.89in.)
Cut-out Dimensions
Diameter Ø: 300mm (11.81in.)
Net Weight
6kg (13.2lbs)
Mounting Depth from Surface
168mm (6.62in.)
Optional Rough In Frame
Ideal Rear Volume
Minimum Rear Volume
THX® Certified Ultra
Safety and Regulatory Compliance
Ceiling thickness (Maximum)
30mm (1.18in.)
Ceiling thickness (Minimum)
6mm  (0.24in.)
KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. THX, the THX logo, and Ultra are trademarks of THX Ltd. THX and the THX logo are registered in the U.S. and other jurisdictions. All rights reserved.


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In-ceiling installation 

Metamaterial Absorption Technology is a joint development with Acoustic Metamaterials Group. 
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