Let's do a safety check first... ensure that the cables are properly connected and they're clean. Bad connections can cause bad volumes.
Second, double click on the volume taskbar icon. You'll get a mixer screen with a few channels. Now, go to edit->preferences and activate all possible checkboxes. Then, ensure that their sound is all the way up. Sometimes, the Master volume is high but the PCM (which is regular audio in my case) can be lower.
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