How to Increase Volume for Youtube Videos

Sometimes videos on Youtube tend to be a little soft in volume, despite you having increased it using the most 2 obvious ways: (1) the volume slider on the Youtube video itself; and (2) the volume slider on your device/PC

Is there any other simple way of raising the volume, short of buying an external amplifier with its own speakers?

Here's a tip on how to increase the volume within Windows7's own software:

1. Go to Control Panel > Hardware & Sound > Sound
2. On the "Playback" tab, ensure the "Speakers/Headphones" option is selected, then click the "Properties" button below.
3. Go to the "Enhancements" tab, and TICK the "Loudness Equalization", then OK.
Note: You can hear the immediate difference by using the "Preview" button to test before and after scenarios.