The 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 users 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.Main Features:Active noise compensation (NoiseGard) additionally reduces noise by up to 15 dB. No batteries required: Power supply via microphone bias voltage from the commentators 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 monitoringDynamic Microphone, which stands out due to a strong and powerful sound pattern for an audio transmission in highest broadcast quality even in noisy environmentsActiveGard (on/off switch) for protected hearing against noise peaks > 110dBModular concept of different cables and boom arms to offer highest flexibilityCables of the cable 26-II series are compatibleSwiveling ear cap for single sided listeningMicrophone can be worn either on right or left hand sideWide headband padding is included that converts the two-piece headband into a compact single pieceWhat’s Included?1 HMDC 271 large headband padding1 wind and pop screen1 cable clip1 QuickGuide1 SafetyGuide1 Cable-II-XK31Specifications:Impedance 64 ohmsFrequency response (microphone) 40 Hz 18 kHzTransducer principle (Microphone) dynamicFrequency response (headphones) 8 Hz 18 kHzMicrophone BMD 434Max. sound pressure level ActiveGard Limiter off: 128 dB SPL @ 1 kHzActiveGard Limiter on: 110 dB SPL @ 1 kHzContact pressure approx. 3.3 NEar coupling circumauralPick-up pattern Hyper-cardioidMicrophone sensitivity 0.5 mV/Pa @ 1 kHzMaximum sound pressure level (passiv) 128 dB SPL @ 1 kHzActiveGard 110 dB SPL @ 1 kHzDistortion < 0.1% @ 1 kHz, 100 dB SPLTransducer principle (headphones) dynamic, closedWeight w/o cable approx. 240 g