Cinematic - KEF Ci200QSB-THX In-wall Passive Subwoofer The KEF Ci200QSB‑THX delivers cinema-level bass without occupying floor space. It integrates seamlessly into walls while producing deep, precise low frequencies. The single 200 mm driver moves substantial air, creating immersive soundtracks and music playback that anchors your home theatre with authority. Certified THX Ultra2 and Select2 certification guarantee reference-level performance. The subwoofer reproduces bass with accuracy and minimal distortion, ensuring tight, controlled low frequencies that match the demands of high-end cinematic and music systems. Flexible You can operate the subwoofer passively or pair it with KEF’s KASA500 amplifier for full active THX performance. The built-in crossover in passive mode provides smooth integration with main speakers, while active operation maximises output and dynamic impact without straining the driver. Discreet The magnetic grille and ultra-thin paintable bezel let the subwoofer disappear into your décor. Its low-profile design maintains clean wall aesthetics while delivering bass depth that competes with much larger floor-standing units. Robust Installation uses dog-leg clamps that secure firmly into drywall or plasterboard. The slim wall cavity depth and flexible cut-out dimensions suit both retrofits and new builds. Once installed, the subwoofer remains stable and delivers consistent, room-filling bass for years of high-performance operation. The KEF Ci200QSB‑THX combines certified THX performance with discreet in-wall design. It delivers precise, deep bass while maintaining a clean aesthetic, making it ideal for serious home theatres that demand both impact and subtlety. Specification Value Nominal impedance (passive) 6 Ω Sensitivity (2.83 V / 1 m) 85 dB Crossover frequency (passive) 100 Hz Frequency response (passive) 40 Hz – 100 Hz Frequency response (active) 18 Hz – 140 Hz Maximum SPL 104 dB Drive unit 200 mm sub-bass driver Recommended amplifier power 10 – 150 W (passive) Product external dimensions (H × W × D) 273 × 273 × 106 mm Cut-out dimensions (H × W) 238 × 238 mm Mounting depth from surface 101.6 mm Wall thickness (min – max) 6 mm – 40 mm Net weight 3.3 kg
