Sennheiser HD400 manual Using the headsets, Turning NoiseGard on/off, Adjusting the volume

Using the headsets

Turning NoiseGard™ on/off

With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset.

Turn on the NoiseGard™ active noise compensation by setting the ON/OFF switch to ON. When using the BP-03 battery pack, set the NoiseGard™ ON/OFF switch to ON and use the ON/OFF switch on the battery pack.

Mono/Stereo selection (except HMEC 305, HMEC 305-C, HMEC 322 and HMDC 322)

In general, you’ll receive a mono sound source so that the Mono/Stereo switch can remain set to “Mono”. When using a stereo intercom system, set the Mono/Stereo switch to “Stereo”.

Adjusting the volume

Exposure to loud sounds can cause hearing damage!

Set the volume control to a medium value. Make sure that you can hear critical sounds such as warning alarms.

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