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Manual abstract: user guide SENNHEISER HDC 451-1PRODUCT SHEET
Detailed instructions for use are in the User's Guide.
[. . . ] HDC451-1
Active Noise Cancellation Headphone
· Lightweight (3. 9 oz) · Active noise cancellation -10dB · In-line battery pack
HDC451-1:
Active Noise Cancellation Portable Headphone
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. [. . . ] 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 work place 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. The HDC451-1 comes with a two year parts and labor warranty.
SPECIFICATIONS
Transducer Principle Frequency Response Impedance Distortion (THD) Nominal input voltage (AF) Attenuation Power Supply Open-Air®, Dynamic 20 Hz - 18, 000 Hz 270 Ohms 1% 94 dB 10 dB between 400 - 1000 Hz 2 x 1. 5 V "AA" cells (Alkaline) 2 x 1. 2 V "AA" cells (NiCd 600mA) Approx. 110 g (3. 9 oz. ) 1/8" mini stereo plug for audio signal
Operating Time
Headphone Caliper Pressure Weight Without Cable Connector
SENNHEISER ELECTRONIC CORPORATION, ONE ENTERPRISE DRIVE, P. O. [. . . ] World Wide Web: http://www. sennheiserusa. com Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany HDC451-1 7/97 [. . . ]
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