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Tannoy CMS601 BM Ceiling Monitor - Pair (Discontinued)
Part # 8001 4500
Model # CMS601 BM

The Tannoy CMS 601 BM this aluminium high frequency dome has a deep drawn skirt that sits on the inside of the low frequency voice coil in the same magnetic gap.



The design comprises a 165mm (6.50") transducer mounted in a vented, injection moulded, paintable front baffle manufactured from UV/weather resistant UL94V-0 ABS material.

The point source configuration of the Tannoy ICT TM driver s mid-bass and tweeter sections ensures a wide and controlled dispersion for optimum coverage; this while avoiding the massive loss of energy in the vertical plane, at the crossover frequency, inherent in two-way discrete designs. The ICT (Inductive Coupling Technology) drive unit also addresses the two most common component failures experienced in background music and sound reinforcement systems, the tweeter and the crossover reliability. The use of a wireless electromagnetic tweeter means that no crossover is required in the design; this therefore ensures that an ICT TM unit is exceptionally reliable and therefore ideal for applications where constant heavy usage is the norm. This aluminium high frequency dome has a deep drawn skirt that sits on the inside of the low frequency voice coil in the same magnetic gap. The skirt is like a single shorted turn that is induced with high frequency information generated by the low frequency voice coil, which is fed a full bandwidth signal. The mineral loaded polypropylene cone material and nitrile rubber surround further enhance durability and long-term reliability.

This compact unit is specifically designed for applications requiring the combination of premium sonic quality for music and speech reinforcement with  exceptional reliability.

The CMS 601BM is equipped with a low insertion loss 60W line transformer easily configurable to the following settings via front baffle mounted rotary tapping switch.



  • 165mm (6.50") ICT TM transducer for greater durability and longevity.
  • High power & high sensitivity with extended frequency response.
  • Wide, controlled constant directivity dispertion for optimum coverage.
  • Does not suffer from massive loss of energy in the vertical plane at crossover caused by two way discreet designs.
  • UV/weather resistant UL94V-0 ABS front baffle.
  • Blind Mount & Pre Install options .
  • No crossover required.
  • Easily accessible tapping switch on front baffle.
  • Low insertion loss 60W line transformer.
  • Packaged with tile rails and C-ring for quick & easy installation and simple stocking logistics.
  • Five year warranty.
Frequency Response (-3dB) 78Hz - 22kHz Back can
Frequency Range (-10dB) 51Hz - 24kHz Back can
System Sensitivity (1W @1m) 91dB (1W = 2.45V for 6W)
Nominal Coverage Angle 90 degrees conical
Coverage Angle (1kHz to 6kHz) 92 degrees conical
Directivity Factor (Q) 7.1 averaged 1kHz to 6kHz
Directivity Index (DI) 7.9 averaged 1kHz to 6kHz
Rated Maximum SPL 108dB (average), 112dB (peak)
Rated Maximum SPL : Peak 112dB
Power Handling
Average 60W
Programme 120W
Peak 240W
Recommended Amplifier Power 120W @ 6 Ohms
Nominal Impedance 6 Ohms
Transformer Taps
70V 60W / 30W / 15W / 7.5W / OFF & Low Impedance operation
100V 60W / 30W / 15W / 7.5W / OFF & Low Impedance operation
10% Full Power 2nd Harmonic, 3rd Harmonic
250Hz 1%, 0.14%
1kHz 1.4%, 0.45%
10kHz 1%, 0.1%
1% Full Power 2nd Harmonic, 3rd Harmonic
250Hz 0.32%, 0.14%
1kHz 0.45%, 0.22%
10kHz 0.32%, 0.1%
Crossover 7kHz inductively coupled
Low Frequency 1 x 165 mm (6.5") mineral loaded polypropylene ICT™
High Frequency 1 x ICTTMaluminium dome
Back can Zinc plated steel
Baffle Reflex loaded UL 94V-0 rated ABS
Grille Steel, with weather resistant coating
Safety Features Safety ring located at rear of enclosure for load bearing safety bond
Clamping Design Security toggle clamp
Min / Max Clamping Range 0.0mm (0.0") / 20.0mm (0.79")
Recommended Clamp Torque 1.5Nm
Back Can Options
Blind Mount (BM) Complete with fixed back can
Cable Entry Options Cable clamp and squeeze connector for conduit up to 22mm
Conduit Knockouts 3 Sets of horizontal positions 19 / 22 / 28mm (0.75" / 0.87" / 1.10")
Connectors Removable locking connector with screw terminals with "loop through" facility
Safety Agency Ratings UL-1480, UL-2043, CE
Included Accessories C Ring, tile bridge, paint mask, cutout template, grille
Optional Accessories Plaster (Mud) Ring
BM Hole Cutout Diameter 253 mm (9.96")
PI Hole Cutout Diameter 253 mm (9.96")
Bezel diameter 280 mm (11.02")
Front of ceiling to rear of back can 258 mm (10.16")
Front of ceiling to top of safety loop 275.5 mm (10.84")
Net Weight (ea) 14.33 lbs (6.50 kg)

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