HDC451-1
Active Noise Cancellation Headphone
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
Built for the purpose of reducing
potentially damaging low frequen-
cies, the HDC 451 incorporates
tiny microphones that monitor the
acousticenvironmentdetecting fre-
quencies between 400 and 1000
Hz. Abuilt-inprocessorgenerates
reverse-phasesignalsinthesame
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.andofferexceptional highwear-
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
TransducerPrinciple
FrequencyResponse
Impedance
Distortion(THD)
Nominalinputvoltage(AF)
Attenuation
PowerSupply
OperatingTime
HeadphoneCaliper
Pressure
WeightWithoutCable
Connector
Open-Air®,Dynamic
20 Hz - 18,000 Hz
270Ohms
1%
94 dB
10dBbetween 400 - 1000 Hz
2x1.5V "AA" cells(Alkaline)
2 x 1.2 V "AA" cells (NiCd
600mA)
Approx.80hourswithalkaline
cells
Approx.20hourswithNiCd
600mA
Approx. 1.6 N (5.6 oz.)
Approx. 110 g (3.9 oz.)
1/8” mini stereo plug for
audiosignal
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-
sengerinanautomobile. Notonly
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
