Skip disability assistance statement.

Welcome to our website! As we have the ability to list over one million items on our website (our selection changes all of the time), it is not feasible for a company our size to record and playback the descriptions on every item on our website. However, if you have a disability we are here to help you. Please call our disability services phone line at 215-997-4300 during regular business hours and one of our kind and friendly personal shoppers will help you navigate through our website, help conduct advanced searches, help you choose the item you are looking for with the specifications you are seeking, read you the specifications of any item and consult with you about the products themselves. There is no charge for the help of this personal shopper for anyone with a disability. Finally, your personal shopper will explain our Privacy Policy and Terms of Service, and help you place an order if you so desire.

The Best TV Shop Near Doylestown, PA

Ci250RRM-THX

Kef SP4023AA

Quick Specs

  • Type: Speakers
 
KEF's First Architectural Speaker with MAT ™

Featuring innovative technologies including 12 th Generation Uni-Q ® driver array with Metamaterial Absorption Technology (MAT), patent-pending Cavity Radiation Control and Low Diffraction LF Aperture, Ci250RRM-THX is a truly revolutionary coaxial three-way architectural speaker that delivers immersive, high-fidelity soundstage with unmatched sonic excellence for large home theatres and living rooms.



Pushing technological boundaries
KEF always pushes the technological boundaries in its mission to create the best possible sound; Ci250RRM-THX is the physical manifestation of that drive.

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 12 th 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.

The latest patent-pending technology developed by the KEF Engineering team in the UK; Cavity Radiation Control (CRC) is a unique open-backed midrange with acoustically absorptive foam design that eliminates midrange distortion, up to 30dB midrange dip, 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.

Powerful, high-fidelity sound
As part of the Extreme Home Theatre line-up within KEF Architectural Speakers, Ci250RRM-THX is engineered to deliver powerful, room-filling, high-fidelity sound for the most discerning music and movie lovers.

Featuring a 250mm (10 in.) LF driver, Ci250RRM-THX delivers deep, room-filling bass down to 28Hz. Together with the 100mm (4 in.) Uni-Q driver array with MAT, Ci250RRM-THX delivers powerful, high-fidelity sound with maximum SPL of 111dB. 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.

Designed to perform
Engineered to be structurally robust with a premium aesthetic, the bespoke Ultra-Thin Bezel (UTB) offers the slimmest visible rim around the speaker while casting virtually no shadow. The paintable UTB and magnetic grille ensures the speaker seamlessly blends into the environment.

Ci250RRM-THX is splash water and dust proof with IP64 certification. With a well-considered mechanical design, Ci250RRM-THX ensures ease of installation with minimum of fuss. Grille On Grille Off
Nominal Impedance 8 Ohms
Sensitivity (2.83V/1m) 89dB
Frequency Response (±6dB) Open-backed 28Hz - 20kHz
Frequency Range (-10dB) 20Hz - 45kHz
Nominal Coverage (Degrees) 120
Max SPL 111dB
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 Technology 1
Recommended Amplifier Power 50 - 250W
Recommended High-pass Filter (Hz) 30 - 60Hz
Product External Dimension Diameter (dia): 346mm (13.62in.)
Depth: 175mm (6.89in.)
Cut-out Dimensions Diameter (dia): 300mm (11.81in.)
Net Weight 6kg (13.2lbs)
Mounting Depth from Surface 168mm (6.62in.)
Optional Rough In Frame -
Ideal Rear Volume 150L
Minimum Rear Volume 80L
Certification THX ® Certified Ultra
Safety and Regulatory Compliance IP64
Ceiling thickness (Maximum) 30mm (1.18in.)
Ceiling thickness (Minimum) 6mm (0.24in.)
Remarks 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.

Quick Specs


  • Appearance

  • Type: Speakers

Manual

Individual Information Spec. Sheet

Architectural Speaker Brochure

Product Group Spec. Sheet

Minimum Cabinet Volume Chart

Cutout Template

Product Drawing

Selection And Setup Guide

Architectural Speaker Accessory Guide

Extreme Home Theatre Info Sheet

White paper

Get Adobe Reader

* Documents require Adobe Reader.

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Electronics can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new electronics should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.