Sennheiser Headphones HDC 55 User Guide

HDC 55 NoiseGard™  
Cat. No. 004860  
Cat. No. 004859  
Cat. No. 005222 HDC 551-16-0  
Cat. No. 005223 HDC 551-26-0  
HDC 55-16  
HDC 55-26  
Products for Industry | Stereo Headphones with  
NoiseGard™ Active Noise  
Compensation  
General Description  
First class stereo headphones with NoiseGard™ active noise compensation  
of up to approx. 10 dB. The HDC 55/HDC 551 NoiseGard™ headphones are  
small, light, robust and comfortable to wear. The ear pads can easily be  
changed, and the headphones can be supplied with any company logo  
printed on them (from 500 pieces).  
Technical Data  
Frequency response .................................................20 – 18,000 Hz  
Transducer principle.................................................. dynamic, open  
Nominal impedance ................................................................. 270  
THD ...............................................................................................< 1 %  
Active noise compensation..........................................10 dB 3 dB  
(between 300 – 900 Hz)  
Operating voltage  
HDC 55-16/-26...........................................11 – 16 V DC, typ. 7 mA  
HDC 551............................................................... 2 x AA size battery  
Operating time...............................................................approx. 60 h  
Ear coupling ......................................................................supra-aural  
Contact pressure...........................................................approx. 1.6 N  
Weight (without cable)..............................................approx. 115 g  
Connection cable................................................... 1.4 m, dual-sided  
Connectors  
HDC 55-26............................special right angled 3-pin connector,  
2.5 mm jack and 3.5 mm double mono jack,  
seat powering (ARiNC type C2)  
HDC 55-16............................special right angled 2-pin connector,  
2.5 mm jack and 3.5 mm stereo jack,  
seat powering (ARiNC type C1)  
HDC 551-16-0 ........................... 3.5 mm right-angled stereo jack,  
battery powering (ARiNC type A1)  
HDC 551-26-0 ...............right-angled 3.5 mm double mono jack,  
battery powering (ARiNC type A2)  
Features  
Light  
Compact design  
Swivelling earpieces  
Robust  
Replaceable ear pads  
Excellent frequency response  
HDC 551 with in-line battery pack  
Company logo option  
2-pin special connector  
3-pin special connector  
Recommended Accessories  
Hygiene pads  
Cat. No. 081452  
Cat. No. 004859  
Product Variants  
HDC 55-26, 3 Klinkenstecker: 2.5 + Doppel 3.5  
HDC 55-16, seat powered, 2.5 mm Klinke + 3.5 mm  
stereo jack (=Doppelstecker)  
HDC 551-16-0, battery powered  
HDC 551-26-0, battery powered  
Cat. No. 004860  
Cat. No. 005222  
Cat. No. 005223  
 

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