KEF Ci250RRM-THX 10" 3-Way THX Ultra In-Ceiling Speaker
£1,449
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Sold asSingle
Impedance8Ω
Amp power50–250W
Warranty2 years
IP64Bathrooms
KEF Ci250RRM-THX 10" 3-Way THX Ultra In-Ceiling Speaker
£1,449
£1207.50 ex VAT
Order by 1pm Mon–Fri for same-day dispatch
Free tracked UK delivery · Next day £11.99
30-day returns · full manufacturer warranty
Grille included as standard
You'll need an amplifier
These are passive speakers, so they need an amplifier to power them (8Ω, 50–250W recommended). Either of these will drive a pair and stream music from your phone.
Need speaker cable?
Allow about 10m per speaker for a typical run back to the amplifier. Webro 16/2 LSZH (low smoke, zero halogen) is the right cable for runs in ceilings and walls.
The KEF Ci250RRM-THX is KEF's first architectural speaker with Metamaterial Absorption Technology (MAT). A 12th-generation Uni-Q driver array sits in front of a 10in bass driver to make a true three-way coaxial in-ceiling speaker, with the scale and bass extension for large home cinemas and living rooms.
Why we like it
- Three-way coaxial design: 10in bass driver plus 4in Uni-Q midrange with a MAT-equipped tweeter
- Metamaterial Absorption Technology absorbs 99% of unwanted sound from the back of the tweeter for cleaner, more natural treble
- Bass extension down to 28Hz (±6dB), so it can work without a subwoofer in many rooms
- THX Certified Ultra and IP64 rated
- Ultra-Thin Bezel and paintable magnetic grille
Installation notes
The Ci250RRM-THX needs a 300mm round cut-out and 168mm of mounting depth from the surface, so check ceiling void depth before you buy. KEF recommends an ideal rear volume of 150 litres (80 litres minimum). It is an 8 ohm speaker with 50-250W recommended amplifier power, so it suits an AV receiver or dedicated power amplifier.
Specifications
| Nominal Impedance | 8 Ohms |
| Sensitivity | 89dB (2.83V/1m) |
| Frequency Response | 28Hz - 20kHz (±6dB), open-backed |
| Crossover Frequency | 540Hz, 2.6kHz |
| Drive Units | LF: 250mm (10in); MF: 100mm (4in) Uni-Q; HF: 19mm (0.75in) vented aluminium dome with MAT |
| Recommended Amplifier Power | 50 - 250W |
| Maximum SPL | 111dB |
| External Dimensions | Diameter 346mm; Depth 175mm |
| Cut-out Diameter | 300mm |
| Mounting Depth from Surface | 168mm |
| Net Weight | 6kg |
| IP Rating | IP64 |
| Certification | THX Certified Ultra |
Questions we get asked
Does it come with a grille?
Yes. Every ceiling and in-wall speaker we sell comes with its grille in the box. Manufacturer photos often show the speaker with the grille removed so you can see the drivers, but the grille is always included.
Will it fit my ceiling?
You'll need a 300mm cut-out and at least 168mm of depth behind the ceiling surface. The visible trim is 346mm across. Standard plasterboard ceilings with joists are usually fine; check for pipes, cables and insulation before cutting. Not sure? Send us a photo or plan and we'll check it for you.
Do I need an amplifier?
Yes. These are passive speakers, so they need an amplifier or AV receiver to drive them. They're rated at 8Ω with 50–250W recommended amplifier power. For most rooms a Sonos Amp or WiiM Amp is ideal: each drives a pair and streams from your phone. You can also buy a package with the amp included and save 5%.
Do I need a fire hood?
If there's a habitable room above (for example a bedroom), or the ceiling forms part of a fire escape route, Building Regulations require each speaker to be fire-rated, usually with a fire hood fitted over the back. Hoods also cut sound travelling to the room above. See all fire hoods.
How many speakers do I need?
As a rule of thumb: a pair for most bedrooms, kitchens and living rooms up to about 20m², two pairs for large open-plan spaces, and a single stereo speaker (T2 / stereo models) for small rooms like en-suites. For home cinema, use 5 or 7 speakers plus a subwoofer. Our free design service will plan positions and sizes from your floorplan.
Is it sold singly or as a pair?
Priced per speaker. Add the quantity you need; most rooms use a pair.
When will it arrive?
Orders placed by 1pm Monday to Friday are dispatched the same day. Standard tracked delivery is £7.99, or free on orders over £50; next working day delivery is £11.99. Delivery details.
Can I return it?
Yes. Unused items can be returned within 30 days of delivery, and every product carries the full manufacturer warranty. Returns & warranty.