The KEF CI250RRM-THX ranks #7 out of 28 total In-Wall & In-Ceiling Speakers for sound quality. See all Passive Home rankings for every top pick.
Brand: KEF
Prices on this page were last checked October 21, 2026 at 9:52 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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#7 KEF CI250RRM-THX: $4,397.90 per pair Amazon $2,198.95 Abt Electronics $2,999.99 eBay
Same family: the KEF Ci3160RLM-THX (larger in-wall, ranked higher, rated 4.5/5). See every KEF Ci THX In-Wall generation.
Pros: An in-ceiling speaker with very deep bass for its type, voiced for Atmos height or surround channels and great with room correction. Independently measured by Audio Science Review to a genuine 51.3Hz at -3dB and roughly 23.3Hz at -10dB, the deepest bass extension of any in-wall or in-ceiling speaker in this category. It’s a THX-certified 3-way coaxial design, a 10” woofer built around a 4” Uni-Q midrange and 1” aluminum dome tweeter, deliberately voiced for the 30-60 degree off-axis angle typical of a ceiling-mounted Dolby Atmos height or surround channel rather than a straight-down listening position. Run through a receiver’s automated room correction, spinorama’s EQ-adjusted figures show its preference score climbing from 4.67 to 5.68, so it responds well to correction. Measured bass extension of 51.3Hz (-3dB).
Cons: At $2199 each, this is the most expensive speaker in this category. Its raw on-axis measurement trails the KEF Ci3160RLM-THX (preference score 4.67 vs. 4.62) since the driver array is tuned for off-axis dispersion rather than a flat straight-ahead response, and its on-axis deviation averages 1.14dB, a notably rough figure on-axis due to that off-axis optimization.
| Released | Sep 2022 (4 years ago) |
|---|---|
| Bass Extension (-10dB) | 23.3Hz (measured, spinorama.org ASR data) |
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org ASR data) |
| Certification | THX |
| DIY Kit | No |
| Dimensions | 13.6” x 13.6” x 6.9” (346 x 346 x 175 mm) (168mm mounting depth) |
| Drivers | 10” LF woofer, 4” Uni-Q midrange, 1” vented aluminum dome tweeter with MAT (3-way coaxial) |
| Enclosure | Open-backed, in-ceiling |
| Frequency Response | 28Hz-20kHz +/-6dB (manufacturer, open-backed) |
| Impedance | 8 ohms |
| Mounting Cutout | 300mm (11.81 in) |
| Power Handling | 50-250W recommended amplifier power |
| Sensitivity | 89dB |
| Spinorama Preference Score | 4.67 |
| Spinorama Preference Score with Perfect Sub | 6.68 |
| Weight | 13.2 lbs (6 kg) |
Price history (per pair)
$4,397.90 is the lowest price we have tracked since Sep 2026.
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Frequency Response
How the KEF CI250RRM-THX measures across the audible range. A flatter listening window (the sound arriving straight at you) is more neutral: peaks sound forward or harsh, dips sound recessed. The estimated in-room response adds what a typical room does, and there a gentle, even tilt down toward the treble is ideal. Both curves are shifted so their 300 Hz to 3 kHz average sits at 0 dB.
Measurement data: spinorama.org, measured by Audio Science Review.
EQ for a Neutral Response
Flattens the measured listening window from the KEF CI250RRM-THX's own bass extension up to 16 kHz. Set a preamp of -1.6 dB, then add these filters to any parametric equalizer in the signal path: the speaker's app or DSP if it has parametric EQ, a miniDSP, Equalizer APO or Wavelet. Boosts are kept to 3 dB, and EQ cannot fix how evenly the speaker spreads sound off-axis, which is why some speakers gain more than others. Predicted preference score with this EQ: 6.3, up from 4.7 (7.0 with an ideal subwoofer, up from 6.7). Calculated by Speaker Ranking from the spinorama measurements above.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Peak | 548 Hz | +1.6 dB | 0.90 |
| Peak | 1,023 Hz | -1.6 dB | 3.07 |
| Peak | 1,552 Hz | -2.5 dB | 2.45 |