thanks for the welcome and quick answer ^^
I tested the speakers...they are ok. with "no bass" i mean there is no output from the sub in some applications.
sub = Winamp, Mediaplayer, windvd, most games, bsplayer, windows-sounds
no sub = adobe audition, ejay-progs, some games (ex. SW Battlefront)
sub = mediaplayer
no sub = everywhere else ^^, winamp, games, windvd, bsplayer, windows-sounds, adobe audition....
So when i install xp i am forced to watch / listen the windows mediaplayer.