Sennheiser HDC 451-1 NoiseGard Headphones

Sennheiser Updated: 2009-01-07 RSS
Sennheiser HDC 451-1 NoiseGard Headphones

The HDC 451-1 NoiseGard™ mobile are open stereo headphones with active noise compensation for mobile applications.

Features

* Reduction of ambient noise by up to 10 dB
* Protects the hearing and reduces stress
* Lightweight and comfortable to wear
* Considerably improves audio reproduction quality in noisy environments
* Powered via 2 AA size alkaline batteries or environmentally friendly NiCd rechargeable batteries
* Delivery includes: 1 HDC 451 NoiseGard™ mobile
* 2-year guarantee

Delivery Includes

* 1 HDC 451-1 NoiseGard™ mobile
* 1 adaptor to ¼" (6.3 mm) stereo jack plug
* 1 adaptor 2xmono

Technical Data

Transducer principle: dynamic, open
Ear coupling: supraaural
Nominal impedance: 250 Ohm
Input voltage range: 387 mV (1 Pa, 94 dB)
Max. Sound pressure level (aktiv): 100 dB linear
Operating voltage (mains): 2 x 1,5 V
Contact pressure: ca. 1,6 N
Weight w/o cable: ca. 110 g
Connection cable: 2 m
Jack plug: 3,5 mm stereo
Power supply: 2 x 1,5 V (AA) Alkali- Mangan-Batterien oder 2 x 1,2 V Akkus Mignon (AA) 600 mAh
Operating time: ca. 80 h (Batterie) ; ca. 20 h (Akku)
Noise compensation (active): 10 dB ± 3 dB
Frequency response (headphones): 20.....18000 Hz
THD, total harmonic distortion: < 1 %