KEF Ci250RRb-THX – THX Certified In-Ceiling Architectural Subwoofer with Deep Bass

The KEF Ci250RRb-THX is a high-performance in-ceiling architectural subwoofer designed to deliver deep, precise bass for professional and high-end home audio installations. Certified with THX® Ultra, it ensures cinema-quality low-frequency performance with minimal distortion, providing an immersive audio experience for music, movies, and multi-channel systems. Featuring a 250 mm (10-inch) low-frequency driver and requiring the KEF KASA500 amplifier, the Ci250RRb-THX produces powerful output up to 109 dB, covering a frequency range from 16 Hz to KASA settings. Its compact, flush-mount design (346 mm diameter, 153 mm depth) allows for seamless integration into ceilings, with flexible mounting depth and rear volume requirements for optimal acoustic performance. Rated IP64 for moisture resistance, it is ideal for a wide variety of environments, combining elegance, performance, and durability in a discreet in-ceiling package.

Features

• THX® Certified Ultra – Delivers cinema-quality bass performance with precise, distortion-free low frequencies.
• Powerful LF Driver – Equipped with a 250 mm (10-inch) driver for deep, impactful bass down to 16 Hz.
• Optimized for KEF KASA500 Amplifier – Designed to pair perfectly with KEF’s KASA500 for controlled, high-performance output.
• Flush-Mount Architectural Design – Diameter 346 mm with 153 mm depth allows discreet installation in ceilings with mounting depth of 147 mm.
• Flexible Acoustic Requirements – Ideal rear volume 140 L, minimum 70 L; recommended low-pass filter 50 Hz – 120 Hz ensures integration with main speakers.
• Moisture-Resistant & Durable – IP64 rating makes it suitable for bathrooms, kitchens, and other challenging environments.
• Seamless Integration – Supports high SPL (109 dB) and flexible installation in ceilings 6 mm – 30 mm thick.

Specifications

T1S9M8E0/00-BKM