VLC & iTunes

Hi guys,

i have a weird on my iTunes 10.7, when i played the videos/songs on iTunes the sound out is lower than VLC louder as both apps button volume are same setup even from the mac volume button.

i checked to iTunes preferences -> playback, that Sound Enhancer is uncheck.

Is because the sound codec between iTunes and VLC being different?

or anyone of u guys how to make itunes clear sound as VLC?