Using The Audio Function - Acer PD726 Series Manual

Wireless projection

Using the audio function

If "Wireless" is selected as the input source, you can play audio content
through the internal speakers of the projector. You can also plug external
speakers into the WPG's audio-out jack for better audio quality.
Your audio driver may have different terminology for some of the
settings required below.
If you wish to use the WPG's audio features, please ensure that none of
the audio settings is muted.
To set up the audio, you must perform the following steps:
1) Open the Windows® audio controls by double-clicking on the speaker
2) Select Options > Properties.
3) Select Recording in the "Adjust volume for" area.
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icon in the task tray.