Monitor Audio C3M


This high-performance medium-sized Tier 3 in-ceiling loudspeaker is a three-way model featuring an RDT III bass driver, IDC II midrange driver and IDC II tweeter with UD Waveguide II. It has a cut-out dimension of 212 mm and revolutionary patented Quik-Link speaker cable connector and Tri-Grip II for quick, simple, reliable and strong installation and fitting.

Hifi Installation

Product price: £649.00
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SKU: C3M Categories: ,


This high-performance, medium Tier 3 in-ceiling loudspeaker is designed to deliver pristine, engaging acoustics where pristine sound quality is desired. It is a three-way model featuring the very latest acoustic technologies from Monitor Audio.

This really is the last word in installed performance, featuring an RDT III bass driver, IDC II midrange driver and IDC II tweeter with UD Waveguide II. This high-end combination ensures levels of acoustic transparency and detail found in Monitor Audio’s premium loudspeaker ranges, where much of his acoustic technology was developed. It has a cut out diameter of 212 mm and uses the patented Quik-Link speaker cable connecter, which revolutionises the ease and speed of speaker installation. Tri-Grip has also been evolved for simple, reliable and strong fitment.

Optional square or premium grille can be used with this model.


System Format




Frequency Response, Installed (-6dB)

45 Hz – 35 kHz​

Nominal Impedance

6 ohm

Minimum Impedance (20Hz to 20kHz)

4.8 Ohm @ 2 kHz

Sensitivity (2.83Vrms@1m, Installed)

87 dB

Maximum Peak SPL* (single speaker @ 1m Z-Weighted)

116 dB

Continuous Power Handling (RMS into Nominal Impedance, Pink Noise with 6dB Crest Factor)

120 W

Recommended Amplifier Power (RMS into 8 OHM, Music Signal)

45 – 180 W

Drive Unit Complement

1 x 7″ (178 mm) RDT III bass driver
1 x 4″ (102 mm) IDC II midrange driver
1 x 1″ (25 mm) IDC II tweeter

Crossover Frequency

LF/MF: 800 Hz
MF/HF: 3.5 kHz

Mounting Depth

148 mm (513/16“)

Cut-Out Hole Diameter

212 mm (83/8“)

External Dimensions (Including Grille (H x W x D))

242 x 242 x 151​ mm (91/2 x 91/2 x 515/16”)

Weight (each)

3.4 kg (7 lb 8 oz)

Pre-Construction Bracket


Cabinet Finish

Matt black & Orange​ & Green

Sold As

Single Unit

Corner Switch


HF Switch

– /0/ +

MF Switch

– /0/ +

Additional information



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