

KEF Extreme Home Theatre 10'' Round In-Ceiling Speaker. THX Ultra certified. 250mm Uni-Q driver with 19mm aluminium dome tweeter & tangerine waveguide and Z-flex surround. IP64.
- Come with local NZ warranty
- Anywhere in NZ when purchase over $200
KEF Extreme Home Theatre 10'' Round In-Ceiling Speaker. THX Ultra certified. 250mm Uni-Q driver with 19mm aluminium dome tweeter & tangerine waveguide and Z-flex surround. IP64. Sold as each
KEF’s First Architectural Speaker with MAT™
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 an 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.
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 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.
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.
Powerful, high-fidelity sound
Designed to perform
Nominal Impedance
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8 Ohms
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Sensitivity (2.83V/1m)
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89dB
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Frequency Response (±6dB) Open-backed
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28Hz~20kHz
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Frequency Range (-10dB)
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20Hz~45kHz
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Nominal Coverage (Degrees)
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120°
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Max SPL
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111dB
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Crossover Frequencies
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540Hz, 2.6kHz | |
Drive Units | LF: 250mm (10in.) MF: 100mm (4in.) Uni-Q HF: 19mm (0.75in.) vented aluminium dome with Metamaterial Absorption Technology¹ |
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Recommended Amplifier Power
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50W~250W
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Recommended High-pass Filter (Hz)
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30Hz~60Hz
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Product External Dimension
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Diameter Ø | 346mm |
Depth | 175mm | |
Cut-Out Dimensions
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Diameter Ø | 300mm |
Net Weight | 6kg | |
Mounting Depth from Surface
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168mm
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Ideal Rear Volume
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150L | |
Minimum Rear Volume
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80L
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THX Certification
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THX® Certified Ultra
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Safety and Regulatory Compliance
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IP64 | |
Ceiling Thickness (Maximum)
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30mm
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Ceiling thickness (Minimum)
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6mm
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¹Metamaterial Absorption Technology is a joint development with Acoustic Metamaterials Group.
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KEF Extreme Home Theatre 10'' Round In-Ceiling Speaker. THX Ultra certified. 250mm Uni-Q driver with 19mm aluminium dome tweeter & tangerine waveguide and Z-flex surround. IP64.