Quite simply nothing much.
- Not all speakers have built in volume controls
- Media Players have one as standared obviously to allow you to adjust the volume level of whats being played
- The Operating Systems has volume controls to manage the different sounds that it uses, such as your start-up sounds and error sounds, and running programs/games, they put in a control for this which also controls the media player sounds. (In Vista they have built in a mixer to allow you to control the volume levels of different programs/applications seperatly rather than just as a combined level)
Best to have the Media Player and OS volumes turned up and then your speaker volume lower, this will stop the speakers working harder for just general use.
Hope this gives you an insight.
Edited by Emu1616, 09 February 2009 - 08:23 AM.
~ E-Mu ~
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