Sennheiser HDC 451-1 specifications HDC451-1, Active Noise Cancellation Headphone, Specifications

HDC451-1

Active Noise Cancellation Headphone

HDC451-1:

Active Noise Cancellation Portable Headphone

•Lightweight (3.9 oz)

•Active noise cancellation -10dB

•In-line battery pack

Built for the purpose of reducing potentially damaging low frequen- cies, the HDC 451 incorporates tiny microphones that monitor the acoustic environment detecting fre- quencies 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 head- phones with active noise compen- sation are lightweight at only 3.9 oz. and offer exceptional high wear- ing comfort supraaural coupling to the ear.

While wearing the Open-aire NoiseGardTM mobile, you are al- ways addressable since the vocal frequency range is hardly affected

by the noise compensation. Also warning or emergency signals re- main audible. The HDC 451 NoiseGard mobile, incorporates an in-line battery box that can easily be clipped to your clothing, proving ideal for portable applica- tions, especially during travel by train, bus, airplane or as a pas- senger in an automobile. Not only is NoiseGard advantageous for the traveler, it is also appropriate in the work place where air condi- tioning noise, computer hums or typical large area office noise is present. Sennheiser's NoiseGard mobile HDC 451 is an ideal solu- tion for today’s increasingly noisy world.

The HDC451-1 comes with a two year parts and labor warranty.

SPECIFICATIONS

Transducer Principle	Open-Air® , Dynamic
Frequency Response	20 Hz - 18,000 Hz
Impedance	270 Ohms
Distortion (THD)	1%
Nominal input voltage (AF)	94 dB
Attenuation	10 dB between 400 - 1000 Hz
Power Supply	2 x 1.5 V "AA" cells (Alkaline)
	2 x 1.2 V "AA" cells (NiCd
Operating Time	600mA)
	Approx. 80 hours with alkaline
	cells
	Approx. 20 hours with NiCd
Headphone Caliper	600 mA
Pressure	Approx. 1.6 N (5.6 oz.)
Weight Without Cable	Approx. 110 g (3.9 oz.)
Connector	1/8” mini stereo plug for
	audio signal

SENNHEISERELECTRONICCORPORATION, ONEENTERPRISEDRIVE,P.O.BOX987,OLDLYME,CT 06371 TEL:860-434-9190 FAX:860-434-1759.CALIFORNIA:4116WESTMAGNOLIABLVD.,SUITE100,BURBANK,CA91505-TEL:818-845-7366.FAX:818-845-7140 MEXICO: XOLA 613PH6,COLDELVALLE,C.P.03100,MEXICO,D.F.MEXICO-TEL:(525)6390956 .FAX:(525)639 9482.

WorldWideWeb:http://www.sennheiserusa.com ManufacturingPlant:AmLabor1,30900Wedemark,Germany HDC451-17/97