Sennheiser HMEC 25-6A User Manual download pdf (Page 7)

1312

Noise compensation HMEC 25

Reduction/dB

Frequency/Hz

20 100 1000 10000 20000

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.

왘 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.

왘 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.

1 2 3 4 5 6 7 8 9 10 11 12 ... 26 27

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Sennheiser HMEC 25-6A User Manual Page 7