Sennheiser HDC 45-26, HDC 451-1 User Manual

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. 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 3.9 oz. and offer exceptional high wearing comfort supraaural coupling to the ear.

While wearing the Open-aire NoiseGardTM 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 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

Nominal input voltage (AF)

Weight Without Cable

Impedance

Distortion (THD)

Attenuation

Power Supply

Operating Time

Headphone Caliper

Pressure

Connector

Open-Air 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. 80 hours with alkaline cells Approx. 20 hours with NiCd 600 mA

Approx. 1.6 N (5.6 oz.) Approx. 110 g (3.9 oz.) 1/8” mini stereo plug for audio signal

®, Dynamic

SENNHEISER ELECTRONIC CORPORATION, ONE ENTERPRISE DRIVE, P.O. BOX 987, OLD L YME, CT 06371 TEL:860-434-9190 FAX:860-434-1759 . CALIFORNIA: 4116 WEST MAGNOLIA BL VD., SUITE 100, BURBANK, CA 91505 - TEL:818-845-7366

MEXICO: XOLA 613 PH 6, COL DEL VALLE, C.P. 03100, MEXICO , D.F .MEXICO - TEL: (525) 639 09 56

World Wide Web: http://www .sennheiserusa.com

Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany

FAX: 818-845-7140

FAX: (525) 639 94 82

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