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Sennheiser HMD 27 Black Headset

Model #: HMDC 27
At a Glance
Sennheiser HMDC 27 Broadcast Headphones with NoiseGard™ and swiveling ear cap for single sided listening
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$99,999.00Save $NaN

Get to know this product.

LET´S SET BROADCAST-STANDARD TO A HIGHER LEVEL! The HMDC 27 is a closed, circumaural broadcast headset with active noise reduction. It is an ideal choice for commentator and camera work/ Backstage in very loud environments. For ease of operation, the active noise reduction does not require batteries but is powered via the P48 power supply from the broadcast desk. (P12-P48 as per DIN_EN 61938)

The new HMD 27-series invites the Broadcast Commentators and Audio Engineers to experience the highest level of wearing comfort. The top-of-the-line model is the HMDC 27, which features NoiseGard™ (active noise reduction) to perform well in very loud environments. By actively reducing the noise level by additional 15dB this headset increases intelligibility while at the same time protecting the user’s hearing and avoiding stress and fatigue due to noise. NoiseGard™ does not require the usual batteries but is conveniently powered via the microphone power supply from the broadcast desk or intercom system. (Phantom powered P48). The headset is similar to the HMS 26 series equipped with the automatically opening two-piece headband, hence no pressure on the sensitive fontanelle. For those users who still prefer a conventional headband, a wide headband padding is included that converts the two-piece headband into a compact single piece.


  • Active noise compensation (NoiseGard™) additionally reduces noise by up to 15 dB. No batteries required: Power supply via microphone bias voltage from the commentator’s unit (P12-P48 as per DIN_EN 61938)
  • Highest wearing comfort due to the lightweight circumaural design and the splitted headband (no pressure on the sensitive fontanelle)
  • Accurate and linear sound reproduction for very demanding monitoring
  • Dynamic Microphone, which stands out due to a strong and powerful sound pattern for an audio transmission in highest broadcast quality even in noisy environments
  • ActiveGard© (on/off switch) for protected hearing against noise peaks > 110dB
  • Modular concept of different cables and boom arms to offer highest flexibility
  • Cables of the cable 26-II series are compatible
  • Swiveling ear cap for single sided listening
  • Microphone can be worn either on right or left hand side
  • Wide headband padding is included that converts the two-piece headband into a compact single piece

What's in the box?

  • 1 HMDC 27
  • 1 large headband padding
  • 1 wind and pop screen
  • 1 cable clip
  • 1 Quick Guide
  • 1 Safety Guide
  • Cable Sold Separately

Technical Data

  • Impedance: 64 ohms
  • Frequency response (Microphone): 40 Hz – 18 kHz
  • Transducer principle (Microphone): dynamic
  • Frequency response (Headphones): 8 Hz – 18 kHz
  • Microphone: BMD 434
  • Max. sound pressure level: ActiveGard™ Limiter off: 128 dB SPL @ 1 kHz
  • ActiveGard™ Limiter on: 110 dB SPL @ 1 kHz
  • Contact pressure: Approx. 3.3 N
  • Ear coupling: Circumaural
  • Pick-up pattern: Hyper-cardioid
  • Microphone sensitivity: 0.5 mV/Pa @ 1 kHz
  • Maximum sound pressure level (passiv): 128 dB SPL @ 1 kHz
  • ActiveGard™: 110 dB SPL @ 1 kHz
  • Distortion: < 0.1% @ 1 kHz, 100 dB SPL
  • Transducer principle (headphones): Dynamic, closed
  • Weight w/o cable: Approx. 240 g

*Warning (for California residents only): Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Every Consumer Products company is required to post the warning no matter if their products pose any harm. Sennheiser products are all RoHs compliant, yet we are by law required to post the Proposition 65 warning message anyway.



Weight (grams):240


Built-in Microphone:Yes


Impedance:64 Ohms
Sensitivity:0.5 mV/Pa @ 1 kHz

Misc. Specs

Frequency Response40 Hz – 18 kHz
Sport HeadphoneNo
Color Finish NameBlack
CollectionHMD 27
Headphone TypeOver-Ear
WarningProposition 65 Warning for California Residents