About Noiseguard 2.0
NoiseGard™ 2.0 was developed by Sennheiser especially for general aviation and is used in most cockpits around the world today. With NoiseGard™ 2.0 sound waves in the low frequency range are simply cancelled out by their own phase inversion (phase inverted sound). To do this, tiny microphones first pick up ambient noise. The NoiseGard™ electronic circuitry then produces a sound waver that is phase inverted by 180° to the disruptive sound – with the result that both sound waves practically cancel each other out. Sounds such as music or speech on the other hand are reproduced practically unchanged and can thus be excellently understood. Communication with air traffic control is therefore considerably easier. In this way NoiseGard™ 2.0 guarantees you quiet and thus safe flying. NoiseGard™ 2.0 optimizes the NoiseGard™ principle through the use of even more powerful processors and improved microphones for detailed pick-up of the disruptive sound. With the help of matching filters, increased active noise compensation of up to 90% is achieved.

Technical Data Headphones Transducer principle . . . . . . . . . . . . . Dynamic, closed
Ear coupling . . . . . . . . . . . . . . . . . . Circumaural
Frequency response (headphones) . . . . . . . . . . . 8.....28000 Hz
Frequency response (Talk Through) . . . . . . 300.....5000 Hz
Nominal impedance passive . . . . . . . . . . . . . . 150 Ù mono, 300 Ù stereo
Nominal impedance active . . . . . . . . . . . . . 600 Ù mono, 1200 Ù stereo
Sound pressure level passive . . . . . . . . . . 98 dB SPL at 1kHz 1V
Sound pressure level active . . . . . . . . . . . . . . . . . . 100 dB SPL at 1kHz, 1V
Distortion factor . . . . . . . . . . .. . . . . . . . . . < 1% at 94 dB
SPL Attenuation (passive) . . . . . . . .. . . . . . 13 - 34 dB
Attenuation (active) . . . . . . . . . . . 16 - 25 dB
Contact pressure . . . . . . . . . .. . . . . . c. 5 N
Microphone incl. preamplifier Model . . . . . . . . MKE46
Transducer principle . . . . . . . . . . . . . permanently polarized condenser microphone, noise-compensated
Frequency response . . . . . . . . . . . . 350 - 6.000 Hz
Output voltage . . . . . . . . . . . . . . . . 40 mV/Pa (factory setting) = 400 mV at 114 dB SPL (17 - 100 mV/P adjustable)
Terminating impedance . . . . . . . . . . 150 - 2.200 Ù
Operating voltage . . . . . . . . . . . . 8 - 16 V DC

General Data
Weight without cable . . . . . . . . . . . . . . . ca. 285 g
Operating temperature . . . . . . . . . . . . . -10.....+55 °C
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . -55.....55 °C
NoiseGard supply (alkaline recommended) . . . . 2 x AAA 1,5V
Connection cable . . . . . . . . . . . . . . . . . . . 1.85 m
Connector . . . . . . . . . . . . . . . . . . . . . . . 6.3 mm stereo headphones, 5.25 mm microphone
Extras: mono/stereo switch, line / cell phone input, Peak Level Protection, 60 cm audio cable with 2.5 mm /2.5 mm stereo jack (e.g. Mp3 player), 60 cm audio cable with 3.5 mm / 3.5 mm stereo jack (e.g. cell phone)