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HDC451-1

Active Noise Cancellation Headphone

SENNHEISER ELECTRONIC CORPORATION,   ONE ENTERPRISE DRIVE, P.O. BOX 987, OLD LYME, CT  06371  TEL:860-434-9190  FAX:860-434-1759 

CALIFORNIA: 4116 WEST MAGNOLIA BLVD., SUITE 100, BURBANK, CA 91505 - TEL:818-845-7366

 . 

FAX: 818-845-7140

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

 . 

FAX: (525) 639  94 82

 .

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

Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany

HDC451-1 7/97

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
NoiseGard

TM

 mobile, you are al-

ways addressable since the vocal
frequency range is hardly affected

Transducer Principle

Frequency Response

Impedance

Distortion (THD)

Nominal input voltage (AF)

Attenuation

Power Supply

Operating Time

Headphone Caliper

Pressure

Weight Without Cable

Connector

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. 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

HDC451-1:

Active Noise Cancellation Portable Headphone

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.

Lightweight (3.9 oz)

Active noise cancellation -10dB

In-line battery pack

 

SPECIFICATIONS

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