Short answer: choose the CI250RRM-THX for premium Atmos or surround duty; choose the CI200RR-THX when a smaller cutout is more important than bass extension. Both carry THX certification, but the 10-inch three-way has far more low-frequency capability.
The CI250RRM-THX has the deeper and better-documented result. Its independent measurement reaches 51.3Hz at -3dB and roughly 23.3Hz at -10dB. It is intentionally voiced for off-axis ceiling listening, and its EQ-adjusted preference result improves strongly with receiver room correction.
The CI200RR-THX is easier to install but more subwoofer-dependent. Its 238mm cutout is smaller than the CI250’s 300mm opening and its 7.9 lbs (3.6 kg) weight reduces ceiling load. Its 82.5Hz -3dB extension is from lower-confidence vendor data, so it makes more sense as a crossed-over surround or height speaker.
Buy the CI250RRM-THX for the deepest ceiling bass and a room-corrected immersive system.
Buy the CI200RR-THX for a smaller THX ceiling opening with a planned subwoofer crossover.
Looking for alternatives? See the complete Passive Home rankings.
An in-ceiling speaker with very deep bass for its type, voiced for Atmos height or surround channels and great with room correction.
An in-ceiling speaker with an 8 inch woofer and coaxial tweeter, big enough to move real air in a family room.
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Specifications Side By Side
| KEF CI250RRM-THX | KEF CI200RR-THX | |
|---|---|---|
| Price | $4,395.90 per pair | $2,399.98 per pair |
| Ranked | #7 of 28 in In-Wall & In-Ceiling Speakers | #12 of 28 in In-Wall & In-Ceiling Speakers |
| Drivers | 10” LF woofer, 4” Uni-Q midrange, 1” vented aluminum dome tweeter with MAT (3-way coaxial) | 8” woofer, 1.5” Uni-Q tweeter (2.2kHz crossover) |
| Enclosure | Open-backed, in-ceiling | Open-backed, in-ceiling |
| Mounting Cutout | 300mm (11.81 in) | 238mm (9.37 in) |
| Dimensions | 13.6” x 13.6” x 6.9” (346 x 346 x 175 mm) (168mm mounting depth) | 11.4” x 11.4” x 5.2” (290 x 290 x 132.6 mm) (126.5mm mounting depth) |
| Weight | 13.2 lbs (6 kg) | 7.9 lbs (3.6kg) |
| Sensitivity | 89dB | 90dB |
| Impedance | 8 ohms | 4 ohms |
| Power Handling | 50-250W recommended amplifier power | 10-190W recommended amplifier power |
| Frequency Response | 28Hz-20kHz +/-6dB (manufacturer, open-backed) | 33Hz-28kHz +/-6dB (manufacturer, open-backed) |
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org ASR data) | 82.5Hz (measured, spinorama.org vendor data) |
| Bass Extension (-10dB) | 23.3Hz (measured, spinorama.org ASR data) | 30.5Hz (measured, spinorama.org vendor data) |
| Certification | THX | THX |
| Spinorama Preference Score | 4.67 | - |
| Spinorama Preference Score with Perfect Sub | 6.68 | - |
| DIY Kit | No | No |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: KEF CI250RRM-THX (measured by Audio Science Review) and KEF CI200RR-THX (measured by the manufacturer), via spinorama.org.
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