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 26series 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.

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 (passive)
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