i bought EDIFIER 530D less than 3months.. i plug to my desktop.. notice that sound worst than my CHIna brand speaker.. (SUFT SOUND)

it seem like under perform... then i change my desktop onboard sound card to CREATIVE XI-FATILTY PRO...

But is it lack of power to perform.. anyone can help me to settle this problem..

HEre is my desktop spec

:-INTEL CORE 2 Duo 2.2ghz
:- MSI 7104 MOTHERBOARD Platium P45 chipset
:- WINDOW VISTA ULTIMATE 32bit
:- CREATIVE TITATIUM FATILTIY PRO
:- ATI 3870 Vga

Please advise?

owner of 530d...