Built for the purpose of reducing potentially damaging low frequencies, the HDC 451 incorporates tiny microphones that monitor the acoustic environment detecting frequencies between 400 and 1000 Hz. A built-in processor generates reverse-phase signals in the same frequency range that collide with, and cancel, the incoming sound. The Open-Aire® stereo headphones with active noise compensation are lightweight at only 110 g (3.9 oz.) and offer exceptional wearing comfort supraural coupling to the ear.
While wearing the Open-Aire NoiseGard® mobile, you are always addressable since the vocal frequency range is hardly affected by the noise compensation. Also warning or emergency signals remain audible. The HDC 451 NoiseGard mobile, incorporates an in-line battery box that can easily be clipped to your clothing, proving ideal for portable applications, especially during travel by train, bus, airplane or as a passenger in an automobile. Not only is NoiseGard advantageous for the traveler, it is also appropriate in the workplace where air conditioning noise, computer hums or typical large area office noise is present. Sennheiser’s NoiseGard® mobile HDC 451 is an ideal solution for today’s increasingly noisy world.
Sennheiser Sennheiser
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