KEF Ci250RRb-THX 10 Inch In-Ceiling Subwoofer (Each)

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  • $ 1,499.99

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The Extreme Architectural Subwoofer
Engineered to deliver incredibly accurate and powerful bass, Ci250RRb-THX is the perfect addition to any music or home theatre system and an excellent partner to other KEF loudspeakers. Featuring an extra-long-throw 250mm (10 in.) bass driver with a massive 150oz magnet, Ci250RRb-THX delivers exceptional depth with the accuracy needed for an epic music, movie or gaming experience.
Feel the detail in the deep

In order to create the most immersive experience for music and movies, tremendous power is tempered with fine detailing. The extra-long-throw 250mm (10 in.) bass driver of Ci250RRb-THX, when driven by the KEF’s DSP-equipped KASA500 amplifier, delivers both in spades.

As part of the Extreme Home Theatre line-up within KEF Architectural Speakers, Ci250RRb-THX is engineered to deliver high-fidelity sound experience for the most discerning music and movie lovers. Featuring a massive 150oz magnet in the motor system, Ci250RRb-THX delivers thunderous, low-distortion bass down to 20Hz with a maximum SPL of 109dB.  

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.

Ci250RRb-THX is splash water and dust proof with IP64 certification. With a well-considered mechanical design, Ci250RRb-THX ensures ease of installation with the minimum of fuss.
  • Frequency Response (±6dB) Open-backed: 20Hz - KASA setting
  • Frequency Range (-10dB): 16Hz - KASA setting
  • Max SPL: 109dB
  • Drive Units: 
  • LF: 250mm (10in.)
  • MF: -
  • HF: -
  • Required Amplifier: KEF KASA500
  • Recommended Low-pass Filter (Hz): 50Hz - 120Hz
  • Product External Dimension:
Diameter Ø: 346mm (13.62in.)
Depth: 153mm (6in.)
  • Cut-Out Dimensions:
Diameter Ø: 300mm (11.81in.)
  • Net Weight: 5.6kg (12.3lbs)
  • Mounting Depth from Surface: 147mm (5.8in.)
  • Optional Rough In Frame: -
  • Ideal Rear Volume: 140L
  • Minimum Rear Volume: 70L
  • THX Certification: THX® Certified Ultra
  • Safety and Regulatory Compliance: IP64
  • Ceiling Thickness (Maximum): 30mm (1.18in.)
  • Ceiling Thickness (Minimum): 6mm  (0.24in.)

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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