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HDC451-1:
Active Noise Cancellation Portable Headphone
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
SENNHEISER ELECTRONIC CORPORATION, ONE ENTERPRISE DRIVE, P.O. BOX 987, OLD LYME, CT 06371 TEL:860-434-9190 FAX:860-434-1759
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.
HDC451-1
• Lightweight (3.9 oz)
• Active noise cancellation -10dB
• In-line battery pack
Transducer Principle
Frequency Response
Impedance
Distortion (THD)
Nominal input voltage (AF)
Attenuation
Power Supply
Operating Time
Headphone Caliper
Pressure
Weight Without Cable
Connector
.
CALIFORNIA: 4116 WEST MAGNOLIA BLVD., 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
®
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
.
FAX: 818-845-7140
.
FAX: (525) 639 94 82
World Wide Web: http://www.sennheiserusa.com
Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany
HDC451-1 7/97
.
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