HME/HMD 27 Series

Sennheiser HME/HMD 27 ATC/C3 Series are premium-quality, double-sided or single-sided headsets with electret or dynamic microphone and closed circumaural ear cups for air traffic controllers and C3 operators requiring uncompromising sound performance and comfort.
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Designed for demanding air traffic controllers and C3 users, the Sennheiser HMD 27 ATC/C3 Series headsets bring high quality sound to the control room with an exceptional degree of comfort. Its lightweight design succeeds in providing high passive attenuation while remaining comfortable over long hours of use. A noise-cancelling microphone enhances voice intelligibility - even in noisy environments, for confident, clear communication and closed ear cups increase listening accuracy. Sennheiser’s unique, split two-piece headband alleviates pressure on the top of the head for first class comfort and users can choose left or right boom microphone positioning. Sennheiser ActiveGard® technology protects users’ hearing against acoustic injury caused by a sudden sound burst on the line, with no risk of communication drop-out.


  • Sennheiser Voice Clarity for accurate communication, provides a natural listening experience

  • Excellent speech transmission Noisecancelling microphone reduces ambient noise to improve intelligibility and reduce “call-back/read-back” events

  • Two channel stereo mode possible to use one channel for radio communications and one for telephone communications on dual sided headset

  • Sound protection from acoustic injury caused by sudden sound bursts on the line with Sennheiser ActiveGard® technology

  • Single-sided listening with flip away ear cup on dual sided headset

  • Flexible microphone boom Can be worn on either left or right-hand side

  • Superb wearing comfort with patented two-piece automatic headband and soft circumaural ear pads

  • Choice of PTT switches for personal preference

  • Cable and connector A wide range of cables and connectors for customization

What's in the box?

  • Headset
  • Cable clip
  • Windscreen
  • Safety Guide
  • Quick Guide

Technical Data

  • Impedance
    300 Ω
  • Frequency response (Headphones)
    8-18,000 Hz
  • Ear coupling
    Closed, circumaural (around-the-ear)
  • Units in distributor master carton


  • EU Declaration of Conformity
    • EU Declaration of Conformity (190 KB) Download

  • Digital Brochures
  • Fact Sheets
    • HME/HMD 27 Series - Fact Sheet (320 KB) Download

WARNING (for California residents only): This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects and other reproductive harm. For more information go to: