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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