KEF Ci5120QLM-THX THX Ultra In-Wall Speaker
£1,399
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Sold asSingle
Impedance4Ω
Amp power25–250W
Warranty2 years
IP64Bathrooms
KEF Ci5120QLM-THX THX Ultra In-Wall Speaker
£1,399
£1165.83 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 (4Ω, 25–250W 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 Ci5120QLM-THX is the larger sibling of the Ci3120QLM-THX. It uses four 4.75in bass drivers around a 12th-generation Uni-Q driver with Metamaterial Absorption Technology for more output and deeper bass, earning THX Certified Ultra status for larger cinema rooms.
Why we like it
- 12th-generation Uni-Q with MAT
- Four 4.75in bass drivers for higher output and bass to 45Hz (±6dB)
- THX Certified Ultra
- IP64 rated
- Paintable magnetic metal grille and Ultra-Thin Bezel
Installation notes
The Ci5120QLM-THX needs a 795 x 163mm cut-out and 90mm mounting depth from the surface, and suits walls 6-36mm thick. KEF recommends a 70 litre rear volume (35 litres minimum). It is 4 ohm with 25-250W recommended power.
Specifications
| Nominal Impedance | 4 Ohms |
| Sensitivity | 89dB |
| Frequency Response | 45Hz - 20kHz (±6dB), open-backed |
| Crossover Frequency | 440Hz, 2.75kHz |
| Drive Units | LF: 4 x 120mm (4.75in); MF: 100mm (4in) Uni-Q; HF: 19mm (0.75in) vented aluminium dome with MAT |
| Recommended Amplifier Power | 25 - 250W |
| Maximum SPL | 105dB |
| Product Dimensions (H x W x D) | 818 x 186 x 96mm |
| Cut-out Dimensions (H x W) | 795 x 163mm |
| Mounting Depth | 90mm |
| Net Weight | 9.7kg |
| 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 wall?
You'll need at least 90mm of depth behind the wall surface. 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 4Ω with 25–250W 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%.
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.