KEF Ci200QSb-THX Extreme In-Wall or In-Ceiling Subwoofer THX Ultra2 (Pair)

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  • $ 999.99

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THX Certified Ultra 200mm Subwoofer
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 200mm (8in.) 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.
  • Nominal Impedance: 
6 Ohm - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
  • Sensitivity: 
85dB - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
  • Crossover Frequencies: 
100Hz - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
  • Frequency Response: 
40Hz-100Hz - Passive Mode (Crossover "ON")
18Hz-140Hz - Active Mode (KASA500)
  • Drive Units: LF: 200mm (8 in.)
  • Recommended Amplifier Power: 
10-150W - Passive Mode (Crossover "ON")
KASA500 - Active Mode (KASA500)
  • Product External Dimension (H X W X D): Diameter: 273 x 273 x 106 mm (10.75 x 10.75 x 4.17 in.)
  • Cut-Out Dimensions (H X W): 238 x 238 mm (9.37 x 9.37 in.)
  • Mounting Thickness: 
Ceiling Thickness (Maximum): 40mm (1.58 in.)
Ceiling Thickness (Minimum): 6mm (0.24 in.)
  • Mounting Depth From Surface: 101.6mm (4 in.)
  • Optional Rough In Frame: RIF200S
  • Net Weight: 3.3kg (7.28 lbs)

WARNING: California Residents - Proposition 65. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to



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