The KEF Ci3120QLM-THX is a premium THX Certified Select in-wall speaker designed for high-impact home theatre sound in medium-sized rooms. Its 12th-generation Uni-Q driver array delivers wide dispersion and a larger sweet spot for consistent listening across multiple seats. Metamaterial Absorption Technology (MAT™) reduces unwanted sound for cleaner, more detailed highs and natural dialogue clarity. With a paintable magnetic grille and Ultra-Thin Bezel, it blends seamlessly into the wall while delivering true cinema performance.
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KEF Ci3120QLM-THX In-Wall Speaker

The KEF Ci3120QLM-THX is a premium, high-performance in-wall architectural speaker built for modern home theatres where you want true cinema impact without visible floorstanding speakers. THX® Certified Select for medium-sized rooms, it’s engineered to deliver powerful dynamics, precise dialogue, and immersive surround effects with the refined detail KEF is known for. At the heart of the design is KEF’s 12th-generation Uni-Q driver array, which behaves like a single point source to widen the listening “sweet spot” and keep sound consistent across more seats. It also features KEF’s breakthrough Metamaterial Absorption Technology (MAT™) to reduce unwanted sound from the rear of the driver for cleaner, more natural high frequencies. A sleek Ultra-Thin Bezel (UTB) and paintable magnetic metal grille help it disappear into the wall—so you can hide the speaker, not the performance.

What It's Good At:

• True theatre sound at home with THX® Certified Select performance tuned for medium-sized rooms
• Clearer, cleaner high frequencies thanks to MAT™ absorbing unwanted sound for improved detail
• Wider, more even coverage from the Uni-Q point-source design for a larger sweet spot
• Tight, low-distortion bass powered by dual long-throw 120mm bass drivers
• Balanced, accurate sound from a 3-way design with optimized crossover networks
• Seamless in-wall aesthetics with an Ultra-Thin Bezel and paintable magnetic metal grille

KEF Ci3120QLM-THX Full Specifications:

• Model: Ci3120QLM-THX
• Series: Q Series
• Frequency Response Range: 50Hz – 20kHz
• Frequency Response Remark: (±6dB) open-backed
• Frequency Range: 42Hz – 20kHz
• Sensitivity: 89dB
• Nominal Impedance: 4Ω
• Nominal Coverage: 150°
• Maximum SPL: 105dB
• Drive Units:
  • LF: 2 × 120mm (4.75 in.)
  • MF: 100mm (4 in.) Uni-Q
  • HF: 19mm (0.75 in.) vented aluminium dome with Metamaterial Absorption Technology¹
• Crossover Frequency: 440Hz, 2.75kHz
• Recommended Amplifier Power: 25 – 250 W
• Recommended High-Pass Filter (Hz): 35Hz – 100Hz
• Product External Dimensions (H × W × D): 536mm × 186mm × 96mm (21.1in. × 7.3in. × 3.8in.)
• Cut-Out Dimensions (H × W): 513mm × 163mm (20.2in. × 6.4in.)
• Mounting Depth From Surface: 90mm (3.6")
• Mounting Thickness:
  • Maximum: 36mm (1.42in.)
  • Minimum: 6mm (0.24in.)
• Ideal Rear Volume (L): 40
• Minimum Rear Volume (L): 20
• Net Weight: 6.2KG (13.7 lbs.)
• Gross Weight:
  • Single box: 8.3KG (18.3 lbs.)
  • Master box: 17.7KG (39 lbs.)
• Safety and Regulatory Compliance: IP64
• THX Certification: THX Certified Select
• Remarks: ¹ Metamaterial Absorption Technology is a joint development with Acoustic Metamaterials Group.

KEF Ci3120QLM-THX Q&A:

What are the basic steps to install in-wall speakers like the Ci3120QLM-THX?

Choose a suitable location (often between studs), then use the included cutout template to mark the opening. Cut carefully, run speaker wire from your amplifier/AVR to the opening, connect the wiring, and secure the speaker per the manual. Finish by fitting the grille and painting if desired; if you’re unsure about tools, wiring, or wall conditions, a professional installer is recommended.

Are in-wall speakers a good choice compared to traditional box speakers?

In-wall speakers are ideal when you want high-quality sound with a clean, space-saving look. They reduce visual clutter and blend into the room, but placement is permanent once installed and installation takes more work than placing freestanding speakers. KEF’s Uni-Q design helps maintain consistent sound across the room, making in-wall setups especially rewarding in multi-seat spaces.

What should I look for in the best in-wall speakers for a home theatre?

Prioritize wide, even dispersion for multiple seats, clarity for dialogue, and strong dynamics for movie impact—then match the speaker’s performance level to your room size. Technologies like Uni-Q (for point-source imaging) and MAT™ (for reducing unwanted sound) help improve realism and detail. THX certification is also a strong indicator that the speaker is built to meet cinema-style performance targets.

KEF Ci3120QLM-THX Downloads:

KEF Ci3120QLM-THX Manual
KEF Ci3120QLM-THX Specifications Sheet
KEF Ci3120QLM-THX Drawing