Noise-canceling Broadcast Headset: Dynamic Microphone (hyper-cardioid)

The Sennheiser lightweight headsets in theHMDC26600B7 series, with their closed supra-aural design, have been developed for professional broadcast applications. The headphones are designed for particularly high sound pressure levels. The headsets are exceptionally comfortable to wear while providing a high degree of passive noise attenuation. In contrast to the HMD 26, the HMDC 26 600 B7 is equipped with active noise compensation, Sennheiser's NoiseGard�. This makes the headset particularly suited for use in extremely noisy environments.

The dynamic microphone, with a hyper-cardioid pattern features excellent acoustic performance, with linear frequency response over a broad frequency range up to 16 kHz. Another important feature is it is even less sensitive against structure-born sound. The flexible gooseneck microphone can be used on either the left or right side. Both allow users to make exact adjustments to their individual requirements.

600Ω mono, or 1,200Ω stereo, dynamic hyper-cardioid microphone BMD 424.

(Kit) USHMDC26-600-B7 = 502453 502470 (headset and unterminated steel wire cable with battery control unit)

→ Lightweight
→ Extremely comfortable to wear, even for extended listening, due to the two-piece automatic headband and soft ear pads
→ Single-sided cable routing
→ Headphones for high maximum SPL
→ Active Noise Reduction with NoiseGard™
→ ActiveGard (switchable) – safeguards you from volume peaks above 105 dB
→ “Flip-away” headphone allows single-sided listening
→ Dynamic microphone (hyper-cardioid) with linear frequency response
→ Flexible microphone boom, can be worn on either left or right-hand side
→ Microphone mutes when the boom arm is upright
→ Cable, microphone boom and ear pads can be changed easily due to modular concept
→ Warranty 2 years

Transducer principle	dynamic, closed
Ear coupling	supra-aural
Frequency response	20 Hz - 18,000 Hz
Impedance	600Ω mono / 1,200Ω stereo
Sensitivity	108 dB SPL at 1 kHz, 1mW / 110 dB SPL at 1 kHz, 1 V
Max. sound pressure level (active)	120 dB SPL at 1 kHz
Attenuation	≥ 18 dB (100 - 300 Hz)
Attenuation (active passive)	15 - 30 dB
Distortion	< 0.5% at 1 kHz
Contact pressure	approx 3.6N
Microphone	BMD 424
Transducer principle (microphone)	dynamic, hyper-cardioid characteristic
Frequency response (microphone)	40 Hz - 16,000 Hz
Sensitivity in free field, no load (1kHz)	0.4 mV / Pa at 1 kHz
Impedance	300Ω
Operating temperature	-15 °C... 55 °C
Storage temperature	-55 °C... 70 °C
Weight w/o cable	≈ 7.4 oz (210 g)
Power Supply	2 x 1.5 V AA alkaline battery (IEC LR 6) or 2 x 1.2 V AA rechargeable battery (IEC LR 6)
Operating time (battery)	≈ 60 hours