KEF Ci4100QL-THX In-Wall Speaker (Each) - SP3831AA
KEF SP3831AA Ci4100QL-THX In-Wall Speaker (Each)
Ci4100QL-THX is a THX Certified Select in-wall speaker. A deep understanding of the filmmaking process and surround sound is at the very heart of every THX certified 2.1, 5.1 and 7.1 speaker system.
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.
Ci4100QL-THX is a THX Certified Select in-wall speaker. A deep understanding of the filmmaking process and surround sound is at the very heart of every THX certified 2.1, 5.1 and 7.1 speaker system. Engineered with design characteristics of professional studio speakers, THX recreates the tonal balance of the filmmaker's final mix in your living room. The results? Action sequences are impactful, and dialogue-driven moments are natural and engaging.
THX certified in-wall speakers deliver the appropriate frequency response and high output and imaging quality of a traditional box speaker. This provides the best of both worlds - THX surround sound performance from components that blend harmoniously with any room decor.
Features
- UNI-Q®
Uni-Q technology is the building block of KEF signature sound. Uni-Q technology places the tweeter precisely at the acoustic centre of the bass/ midrange cone, so both act together as a single point source to disperse sound more evenly throughout the room. The result is the elimination of the limited ‘sweet spot’, therefore allowing everybody sitting at different spots in the room to experience and enjoy the same natural, detailed sound. - Metamaterial Absorption Technology (MAT™)
A truly revolutionary tool in the KEF acoustic armoury, MAT™ is a highly complex maze-like structure that absorbs 99% of unwanted sound from the rear of the driver, eliminating the resulting distortion and providing purer, more natural sound. - Patent-Pending Cavity Radiation Control
Cavity Radiation Control is a unique open-back midrange with acoustically absorptive foam design that eliminates midrange distortion, up to 30dB midrange dip, found in typical coaxially arranged three-way designs. Cavity Radiation Control enables KEF coaxial three-way architectural speakers to deliver the highest midrange acoustic realism. - THX® Certified
THX® Cert if ied in the performance class of Dominus and Ultra, the formidable KEF Extreme Home Theatre system has jaw-dropping acoustic capabilities with all the drama and emotional intensity of true theatre sound quality. - Extremely Low Profile
KEF’s incredible Ci-T Series is designed for delivering the highest quality sound when mounting depth is at an absolute premium. Even with a mounting depth of only 36mm, the Ci-T Series speakers still deliver exceptional KEF sound quality - Ultra-Thin Bezel
KEF’s architectural range offers the slimmest visible rim around the speaker while casting virtually no shadow. Coupled with a magnetic grille and designed to fit tight into the wall or ceiling, KEF speakers disappear as if part of the ceiling.
General
Approximate Dimensions
Warranty Information
Approximate Weight
Guides
Frequently Asked Questions
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The recommended amplifier power range is between 10 watts and 150 watts. Using an amplifier within this range ensures optimal performance and sound quality from the speaker without causing damage or distortion.
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It features KEF's Uni-Q driver array technology, which places the tweeter at the acoustic center of the bass/midrange cone. This design allows both tweeter and woofer to act as a single point source, producing a wide, even sound dispersion throughout the room for a natural and immersive listening experience.
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Yes, the speaker has an IP64 water resistance rating, meaning it is protected against dust ingress and water splashes from any direction, making it suitable for use in environments where moisture might be present.
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The speaker’s cut-out dimensions for installation are approximately 18.74 inches in height and 4.49 inches in width. The depth from the wall is 3.19 inches, with an overall height of 19.29 inches, width of 5.04 inches, and a depth including the grille of about 3 inches, accommodating a slim in-wall installation.
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Yes, it includes a paintable magnetic grille that allows for easy customization to match your room’s decor. The grille also has an ultra-thin bezel design to minimize visibility and blend seamlessly with the wall.

