





KEF Ci200QSb-THX Custom Install Subwoofers with Long Throw 8” Bass Driver
THX Certified to the level of Ultra and Select, the formidable Ci200QSb-THX in-wall subwoofer delivers deep bass and theatre thumping output capabilities, matched to the uncanny ability to deliver all the drama and emotional intensity of full theatre sound quality.
With a powerful high-output 8” (200mm) sub-bass driver, the Ci200QSb-THX can be used in passive mode to supplement the LF output of KEF’s in-wall or in-ceiling speakers. In Active mode, when 2 pairs of the Ci200QSb-THX subwoofer are powered by 2 KEF KASA500 System Amplifiers the performance meets THX Certified Select specification. When 4 pairs of the Ci200QSb-THX are powered by 2 KEF KASA500 System Amplifiers the performance meets THX Certified Ultra specification.
THX® Certified
Ci200QSb-THX is a THX Certified Ultra in-wall subwoofer. 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 living room. The results? Action sequences are impactful, and dialogue-driven moments are natural and engaging.
THX® certified subwoofers 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 interior.
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.
IP64 Certified
Ci200QSb-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, Ci200QSb-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 Ci200QSb-THX brings cinema-level bass into your home in a way that feels effortless yet undeniably powerful. THX Certified to Ultra standards, this in-wall subwoofer knows how to deliver those spine-tingling rumbles and dramatic low-end moments that make movie nights unforgettable, while still keeping dialogue and subtle details rich and natural. What’s special is how it blends in - discreetly tucked away with a sleek finish, it vanishes into the room until the action kicks in, and then it’s all about the experience. Whether you’re after the heart-thumping energy of an action scene or the immersive depth of a live concert, the Ci200QSb-THX ensures you don’t just hear it - you feel it.
