KEF Ci250RRb-THX Custom Install Subwoofer

KEF Ci250RRb-THX Custom Install Subwoofer with Extra-long-Throw 10” Driver

Engineered to deliver incredibly accurate and powerful bass, Ci250RRb-THX is the perfect addition to any music or home theatre system and an excellent partner to other KEF loudspeakers. Featuring an extra-long-throw 10” (254mm) bass driver the Ci250RRb-THX delivers exceptional depth with the accuracy needed for an epic music, movie or gaming experience.

Feel the Detail in the Deep

In order to create the most immersive experience for music and movies, tremendous power is tempered with fine detailing. The extra-long-throw 10” bass driver of Ci250RRb-THX, when driven by the KEF’s DSP-equipped KASA500 amplifier, delivers both in spades. As part of the Extreme Home Theatre line-up within KEF Architectural Speakers, Ci250RRb-THX is engineered to deliver high-fidelity sound experience for the most discerning music and movie lovers. Featuring a massive 4.25 kg magnet in the motor system, Ci250RRb-THX delivers thunderous, low-distortion bass down to 20Hz with a maximum SPL of 109dB.

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. With a well-considered mechanical design, Ci250RRb-THX ensures ease of installation with the minimum of fuss.

THX® Certified Ultra/Select

Ci250RRb-THX delivers ultra-high performance with true theatre sound quality for large home theatres and living rooms and it is certified to THX® Ultra with the configuration of four Ci250RRb-THX powered by one KEF KASA500 amplifier. When the KEF KASA500 amplifier powers two Ci250RRb-THX, the performance meets the THX® Select standard.

IP64 Certified

Ci250RRb-THX is IP64 certified, which means as well as being impregnable by dust, it is also splash proof. The speaker passed official IEC testing to ensure that splashing water would have no harmful effects on assembly components.

Hide Your Speakers, Not Your Sound

‘Hide your speakers, not your sound’ is the concept behind every KEF architectural speaker. Like all other models in the category, Ci250RRb-THX is designed to be discreet in appearance and engineered with best-in-class acoustic performance, delivering an immersive soundscape while the speakers blend into the interior.

Our Review

The KEF Ci250RRb-THX isn’t just about adding bass - it’s about unlocking a whole new level of depth in your music, movies, and games. This custom install subwoofer brings a rich, powerful low end that feels as effortless as it is impactful, filling the room with detail you can feel as much as hear. Whether it’s the rumble of a film soundtrack, the groove of a bassline, or the atmosphere in a game, it delivers with a sense of precision and authority that makes everything more immersive. And with its sleek, discreet design blending seamlessly into your space, you get all the drama of true theatre-quality sound without any of the visual clutter.