Maximum sound level differs between Ubuntu and Windows

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http://askubuntu.com – Recently I've been watching lots of .mkv or .avi files in my Ubuntu and I realize that the maximum sound level is lower than what is in the Windows with KM Player. This difference is very noticeable in my Ubuntu and bothers me. Is there a solution to this? I have checked all sound levels in Ubuntu, the default and movie player sound level. (HowTos)