Sennheiser Headphones HDC 451 1 User Guide

HDC451-1  
Active Noise Cancellation Headphone  
• Lightweight (3.9 oz)  
• Active noise cancellation -10dB  
• In-line battery pack  
HDC451-1:  
Active Noise Cancellation Portable Headphone  
by the noise compensation. Also  
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. 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.andofferexceptional highwear-  
ing comfort supraaural coupling to  
the ear.  
SPECIFICATIONS  
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 Nominalinputvoltage(AF)  
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.  
Open-Air®,Dynamic  
20 Hz - 18,000 Hz  
270Ohms  
1%  
94 dB  
TransducerPrinciple  
FrequencyResponse  
Impedance  
Distortion (THD)  
Attenuation  
10 dB between 400 - 1000 Hz  
PowerSupply  
2 x 1.5 V "AA" cells (Alkaline)  
2 x 1.2 V "AA" cells (NiCd  
600mA)  
Approx.80hourswithalkaline  
cells  
OperatingTime  
Approx. 20 hours with NiCd  
600 mA  
HeadphoneCaliper  
Pressure  
WeightWithoutCable  
Connector  
Approx. 1.6 N (5.6 oz.)  
Approx. 110 g (3.9 oz.)  
1/8” mini stereo plug for  
audiosignal  
While wearing the Open-aire  
NoiseGardTM mobile, you are al-  
ways addressable since the vocal  
frequency range is hardly affected  
The HDC451-1 comes with a two  
year parts and labor warranty.  
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  
 

Radio Shack GPS Receiver 20 1601 User Guide
Ricoh Printer CL7200 User Guide
RocketFish Headphones RF CNA2 User Guide
RoyalTek GPS Receiver NS 4102 User Guide
Samsung Computer Drive ST320LM008 User Guide
Samsung Washer SW52ASP User Guide
Samsung Washer WF8702RSS User Guide
Sanyo Flat Panel Television DP26649 User Guide
Scytek electronic Automobile Alarm 1000RS DBP User Guide
Sears Treadmill 831248430 User Guide