Phantom Power

Adastra CBM20 boundary microphone

SKU: 952.346

£32.70 £39.24 incl. VAT

White ceiling boundary microphone

In stock



Adastra CBM20 white ceiling boundary microphone

This low profile ceiling or panel mounting boundary microphone has an omnidirectional pick-up pattern which is suitable for use where discreet audio surveillance is required. Applications range from audio pick-up in induction loop systems to audio monitoring and recording for CCTV systems.

  • Phantom powered (9-52Vdc)
  • Threaded for up to 50mm mounting depth
  • Omnidirectional pickup pattern
  • Power supply: 9 – 52Vdc phantom power
  • Cutout: 20mmØ
  • Frequency response: 50Hz-17kHz
  • Max. input SPL: 140dB @ 1kHz (≤1% THD)
  • Sensitivity: -39dB ±3dB (0dB=1V/Pa at 1kHz)
  • Impedance: 200Ω ±30% (at 1 kHz)
  • Dimensions: 70 x 31mmØ
  • Weight: 70g



Founded in 1949, Adastra has earned a reputation for delivering high quality public address systems. Adastra strives to provide complete and versatile solutions for commercial 100v line PA sound installations, with specialist products provided for zoning, noise pollution control, portable public address and induction loop systems. A comprehensive range of associated products are also available, including speaker brackets, rack cabinets, cables and microphones. These products have been created with the user in mind, offering a flexible and modular approach to installation sound systems. For over 60 years Adastra has serviced the needs of the public address sector as a fully established brand name, celebrated for quality and excellence, and will continue to develop and diversify its range in order to remain at the forefront of the industry.

Additional information

Weight0.07 kg
Dimensions7 × 3.1 × 3.1 cm

3 Pin XLR (Male)






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