Monitor Audio C3L 9" In-Ceiling Speaker
If the ceiling has a bedroom or other living space above it, or is part of an escape route, building regulations require each speaker to have a fire hood. Hoods also cut sound leaking into the room above.
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.
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The Monitor Audio C3L is a flagship three-way in-ceiling speaker built for serious listening rooms and dedicated home cinemas. With a substantial 9" bass driver backed by a dedicated midrange and tweeter array, it's designed to anchor a high-end multi-room system or serve as a full-range front or surround channel in an immersive Atmos setup.
Why we like it
- Three-way architecture separates bass, midrange and treble for genuinely hi-fi performance overhead
- RDT III bass driver delivers deep, distortion-free low end rarely found in ceiling speakers
- IDC II mid-pod array and UD Waveguide II tweeter give precise imaging and broad, even coverage
- On-site corner, HF and MF switches let installers tune the sound to the room
- Quik-Link connectors and Tri-Grip II fixings make for a quick, professional install
Installation notes
The C3L requires a square cut-out of 248mm and a mounting depth of 157mm, so check ceiling void clearance before specifying. Overall external dimensions are 278 x 278 x 161mm. Pair with a robust multi-channel AV amplifier or a high-power streaming amp capable of delivering up to 225W to make the most of this speaker's dynamic range; a Sonos Amp or similar may be underpowered for this model's full potential.
Specifications
| System Format | 3-Way |
| Frequency Response (-6dB) | 45 Hz - 35 kHz |
| Nominal Impedance | 6 ohm |
| Minimum Impedance | 4.8 ohm @ 2 kHz |
| Sensitivity | 89 dB (2.83Vrms @ 1m) |
| Maximum Peak SPL | 119 dB |
| Continuous Power Handling | 150W RMS |
| Recommended Amplifier Power | 60-225W RMS into 8 ohm |
| Drive Units | 1x 9" RDT III bass, 1x 4" IDC II midrange, 1x 1" IDC II tweeter |
| Mounting Depth | 157mm |
| Cut-Out | 248mm square |
| External Dimensions | 278 x 278 x 161mm |
| Weight | 5kg |