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Noise compensation HMEC 25
Reduction/dB
Frequency/Hz
20 100 1000 10000 20000
0
10
20
30
40
active
passive
MZQ 2002-1
HMEC 25-6A / HMEC 25-KAP-2
A headset is comprised of two units, a headphone and a microphone. The HMEC
25-6A/-KAP-2 headset is mostly used for communication in aircraft cockpits.
̈ The microphone is a high quality back-electret condenser microphone. As per
ARINC it receives its operating voltage via a connector from the aircraft´s
internal power supply.
̈ The headphone is a Sennheiser NoiseGard
™
system. This is a dynamic
headphone system which, in addition to reproducing the original audio signal,
electronically cancels the low frequencies of the ambient noise. This active
noise compensation operates on the principle that sound and ”anti-sound“ (in
phase opposition) cancel each other out. The NoiseGard
™
compensation
circuitry in the headphone requires an extra power supply, so a battery com-
partment has been integrated into the headset cable (see illustration p. 14).
Clearly intelligible communication is ensured, and the pilot no longer has to
turn the volume up to overcome ambient noise.
NoiseGard
™
increases your comfort,
but it is not a medical hearing protection!
Active noise compensation with NoiseGard
™
Adjusting the headband
Supply schedule
1 HMEC 25-6A or HMEC 25-KAP-2
1 Carrying case
1 wind-shield MZW 45 (Art.No 75823)
1 MZQ 2002-1 clip (Art.No 44740), s. fig.