















Ci200QSb-THX Subwoofer (Pair)
THX ULTRA Certified 200mm Subwoofer Square
Certified to THX ULTRA2 and THX SELECT2 standards, 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.

Ci200QSb-THX
Certified to THX ULTRA2 and THX SELECT2 standards, 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 200mm (8in.) sub-bass driver, the Ci200QSb-THX can be used in passive mode to supplement the LF output of KEF’s Ci series in-wall or in-ceiling speakers. In Active mode, when 2 pair of the Ci200QSb-THX subwoofer are powered by the powerful 250Wx 2 KEF KASA500 System Amplifier the performance meets THX Select2 specification. When 4 pair of the Ci200QSb-THX are powered by 2 KEF KASA500 System Amplifiers the performance meets THX Ultra2 specification.
Fast and Easy to Install
KEF's Ci loudspeaker design makes them so quick and easy to install that once the wire is run and the hole is cut in your wall or ceiling you can be listening to music in less than two minutes.
Key Features
- THX Certified Ultra2 / Select2
- 200mm (8in.) woofer unit with extended bass response
- Paintable Ultra-Thin Bezel (UTB) and magnetic grille to blend unobtrusively with décor
- Fast, versatile installation on virtually any surface via dogleg
- Can be used in passive mode with internal crossover or active mode with KEF’s KASA500 System Amplifier for THX certified performance
- Weather Resistant
- IP64 Certified
Please visit our Ci Software Download page for more details.
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Model | Ci200QSb -THX |
Series | Q Series |
Nominal Impedance | 6Ω - Passive Mode (Crossover "ON") N/A - Active Mode (KASA500) |
Sensitivity(2.83V/1m) | 85dB - Passive Mode (Crossover "ON") N/A - Active Mode (KASA500) |
Frequency response (±6dB) | 40Hz-100Hz - Passive Mode (Crossover "ON") 18Hz-140Hz - Active Mode (KASA500) |
Crossover frequency | 100Hz - Passive Mode (Crossover "ON") N/A - Active Mode (KASA500) |
Drive Units | LF: 200mm (8 in.) |
Recomended amplifier power | 10-150W - Passive Mode (Crossover "ON") KASA500 - Active Mode (KASA500) |
Product external dimensions | Diameter: 273 x 273 x 106 mm (10.75 x 10.75 x 4.17 in.) |
Cutout dimensions | H x W: 238 x 238 mm (9.37 x 9.37 in.) |
Mounting depth from surface | 101.6mm (4 in.) |
Optional rough in frame | RIF200S |
Weight" | 3.3kg (7.28 lbs) |
** KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. **
Manual | • Open In New Window • Download |
Cutout Template | • Open In New Window • Ci200QSB-THX Manual" download="">Download |
Ci Series Brochure | • Open In New Window • Download |
Ci Series Specification Sheet | • Open In New Window • Download |
Ci Series Minimum Cabinet Volume Chart | • Open In New Window • Download |
Ci Accessory Guide | • Open In New Window • Download |
Ci200QSb EASE GLL Data | • Download |
Product Drawing | • Download |