Short answer: the CI250RRM-THX is for immersive audio or full-range ceiling duty; the CI50R is only for tiny legacy ambient-audio locations.
The CI250RRM-THX has the scale for real system use. Its 10-inch woofer, 4-inch Uni-Q midrange, and 1-inch tweeter reach 51.3Hz at -3dB and are deliberately optimized for typical off-axis ceiling listening. It is THX certified and benefits from room correction.
The CI50R is constrained by its micro enclosure. It fits an 80mm square, 55mm-deep space, but its 2-inch full-range driver rolls off around 170Hz at -3dB. It is discontinued and should be treated as a specialty fill rather than a current main, surround, or height speaker.
Buy the CI250RRM-THX for any demanding ceiling-channel role.
Buy the CI50R only when no larger speaker can physically be installed.
Specifications Side By Side
| KEF CI250RRM-THX | KEF CI50R | |
|---|---|---|
| Price | $2,999.99 | Discontinued |
| Ranked | #2 of 5 in In-Wall & In-Ceiling Speakers | #5 of 5 in In-Wall & In-Ceiling Speakers |
| Drivers | 10" LF woofer, 4" Uni-Q midrange, 1" vented aluminum dome tweeter with MAT (3-way coaxial) | 2" full-range driver |
| Enclosure | Open-backed, in-ceiling | Open-backed (optional rear enclosure), in-ceiling |
| Mounting Cutout | 300mm (11.81 in) | 70mm (2.76 in) with rear enclosure |
| Dimensions | 13.6" x 13.6" x 6.9" (346 x 346 x 175 mm) (168mm mounting depth) | 3.1" x 3.1" x 2.2" (80 x 80 x 55 mm) |
| Weight | 13.2 lbs / 6kg (13.2 lbs) | 2.2 lbs / 1.0kg |
| Sensitivity | 89dB | 82dB |
| Impedance | 8 ohms | 6 ohms |
| Power Handling | 50-250W recommended amplifier power | 10-30W recommended amplifier power |
| Frequency Response | 28Hz-20kHz +/-6dB (manufacturer, open-backed) | 125Hz-20kHz +/-6dB (manufacturer, open-backed) |
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org ASR data) | 170Hz (measured, spinorama.org vendor data) |
| Bass Extension (-10dB) | 23.3Hz (measured, spinorama.org ASR data) | 113Hz (measured, spinorama.org vendor data) |
| Certification | THX | - |
| Discontinued | - | Yes |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- KEF Ci3160RLM-THX vs KEF CI200RR-THX
- KEF Ci3160RLM-THX vs KEF CI130.2CR
- KEF CI200RR-THX vs KEF CI130.2CR
- KEF Ci3160RLM-THX vs KEF CI250RRM-THX
- KEF CI250RRM-THX vs KEF CI200RR-THX
Prices on this page were last checked September 7, 2026 at 7:47 AM 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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The Two Speakers In Full
KEF CI250RRM-THX: $2,999.99 Abt Electronics eBay
Pros: 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 3.76 to 4.78, so it responds well to correction.
Cons: At $2,999.99 each, this is the most expensive speaker in this category. Its raw on-axis measurement trails the Ci3160RLM-THX (preference score 3.76 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, one of the roughest of the batch measured on-axis.
Full KEF CI250RRM-THX review and specifications →
| Bass Extension (-10dB) | 23.3Hz (measured, spinorama.org ASR data) |
|---|---|
| Bass Extension (-3dB) | 51.3Hz (measured, spinorama.org ASR data) |
| Certification | THX |
| 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 |
| Weight | 13.2 lbs / 6kg (13.2 lbs) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KEF CI50R: Discontinued eBay
Pros: At just 80 x 80mm and 55mm deep, this is by far the smallest speaker in this category, small enough to fit into spaces, tight closets, cabinetry, shallow ceiling cavities, that none of the other in-wall or in-ceiling models here can reach.
Cons: No longer sold as a current KEF product; dealer listings mark it a legacy item replaced in KEF’s lineup, so buying one now means used or leftover new-old stock rather than a current retail purchase. It measures the shallowest bass extension of any speaker in this category by a wide margin, reaching only about 170Hz at -3dB and roughly 113Hz at -10dB, consistent with a small background or ambient-audio speaker rather than one built for full-range listening. Discontinued.
Full KEF CI50R review and specifications →
| Bass Extension (-10dB) | 113Hz (measured, spinorama.org vendor data) |
|---|---|
| Bass Extension (-3dB) | 170Hz (measured, spinorama.org vendor data) |
| Dimensions | 3.1" x 3.1" x 2.2" (80 x 80 x 55 mm) |
| Discontinued | Yes |
| Drivers | 2" full-range driver |
| Enclosure | Open-backed (optional rear enclosure), in-ceiling |
| Frequency Response | 125Hz-20kHz +/-6dB (manufacturer, open-backed) |
| Impedance | 6 ohms |
| Mounting Cutout | 70mm (2.76 in) with rear enclosure |
| Power Handling | 10-30W recommended amplifier power |
| Sensitivity | 82dB |
| Weight | 2.2 lbs / 1.0kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons