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KEF Ci200QSb-THX and Ci200TRb In Wall Subwoofer Preview



  • Product Name: Ci200QSb-THX and Ci200TRb
  • Manufacturer: KEF
  • Review Date: October 24, 2016 10:00
  • MSRP: $400 each Ci200QSb-THX $425 each Ci200TRb
  • First Impression: Pretty Cool
  • Buy Now


  • Nominal Impedance    6Ω - Passive Mode (Crossover "ON")
  • Sensitivity(2.83V/1m)    85dB - Passive Mode (Crossover "ON")
  • Frequency response (±6dB)    40Hz-100Hz - Passive Mode (Crossover "ON")
  • 18Hz-140Hz - Active Mode (KASA500)
  • Crossover frequency    100Hz - Passive Mode (Crossover "ON")
  • Drive Units    LF: 200mm (8 in.)
  • Reccomended amplifier power    10-150W - Passive Mode (Crossover "ON")
  • 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.)
  • Weight    3.3kg (7.28 lbs)


  • Nominal Impedance    2 x 8Ω - Stereo Mode
  • 16Ω - Mono Mode
  • Sensitivity    87dB (2.83V/ 1m)
  • Frequency Response    42Hz-120Hz - Passive
  • 32Hz-120Hz - With Kasa500
  • Drive Units    LF: 200mm (8 in.)
  • Recommended Amplifier Power    10-125W - Passive
  • Product Internal Dimensions    Diamater: 290 mm (11.42 in.)
  • Depth: 63mm (2.48 in.)
  • Cutout Dimensions
  • (H x W x D)    H x W: 240mm (9.45 in.)
  • Mounting Depth From Surface    59mm (2.32 in.)
  • Net Weight    1.7kg (3.75 lbs)

We saw two new editions to KEF's  'Q' series line at the 2016 CEDIA Expo show in Dallas, Texas - the Ci200QSb-THX in wall or in-ceiling subwoofer and the ridiculously thin Ci200TRb.

The Ci200QSb is a THX-certified 8” square subwoofer.  When configuring four Ci200QSb-THX subwoofers with a KASA500, THX Select 2 certification standards are achieved. and when configuring eight Ci200QSb-THX subwoofers with a KASA500, THX Ultra 2 certifications standards are met.

200trb width

The Ci200TRb is an ultra-thin architectural speaker with an 8” dual-voice coil subwoofer and a mere 50mm (1.96”) mounting depth.

Both models feature KEF’s Ultra-Thin Bezel (UTB) technology which offers an extremely thin visible rim around the speaker assembly. With the speaker grilles in place the Ci200TRb is indistinguishable from other KEF architectural speakers, giving installers and designers an amazing amount of freedom-of-placement.  200trb back

Both models have two operating modes. In passive mode, these subwoofers would be a great way to add bass response to most architectural sound systems. Both models fit in standard 2”x4” construction cavity allowing a sleek, stylish look in a whole-house sound system. In active mode, both models are matched with KEF’s 250WPC Class-D DSP KASA500 subwoofer amp to create an active in-wall (or in-ceiling) subwoofer with great low-frequency extension and emphasis.

All KEF Ci architectural speakers,  are manufactured to Marine Grade Construction standards: The grilles are coated for corrosion resistance, the speakers include moisture-resistant terminations and finish materials, and the plastics are UV protected. Both models have been built to withstand harsh salt-spray and humid environments, allowing you to safely use these speakers in applications outside in harsh environments.

If you're looking for great bass but don't have the floor space, KEF may have your solution with these new in-wall products.These architectural in wall models will be available starting in December for $400 for the Ci200QSb-THX and for $425 for the Ci200TRb.



Unless otherwise indicated, this is a preview article for the featured product. A formal review may or may not follow in the future.

About the author:
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Tony is our resident expert for lifestyle and wireless products including soundbars. He does most of the reviews for wireless and streaming loudspeakers and often compares soundbars in round ups and helps us cover the trade shows.

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