Go to Control Panel | Sound | Playback | Properties | Enhancements and turn on Loudness Equalization.
[img]http://anderwald.info/wp-content/uploads/2009/04/loudness.png[/img]
What version of windows are you running because I don't have enhancements, after selecting sound I've got four tabs, playback, recording, sounds and communication. Under the playback tab there's AMD HDMI Output, Speakers and SPDFI Interface. If i select speakers and go into properties I got five tabs after that which are, General, Custom, Level, System Effects and Advanced..there's no enhancements what so ever. I can provide screens if necessary.