thanks for the determination bro.

actually for the past 2 days, after some tweaking, i do feel the vibration (finally, thanks God! ). but under normal volume ~40%, the vibration is pretty weak. sweet!

@30%, the vibration is almost can't be felt. after trying some .mp3 with high bass, yes, the vibration is felt perfectly!

this setting and vibration only can be felt when i use together with X-Fi USB 5.1 Surround external soundcard. if using default soundcard in my lappy - none, even @ 100%.

EDIT : in the nutshell - i don't think my Kave is faulty unit. its just my default soundcard with is too crappy.  
p/s : thanks for your recomendation to go for X-Fi USB 5.1 Surrounding. its worth every penny of it

yup. its seems default soundcard between laptop and desktop is not the same afterall.

TS did all his review just using default soundcard on his mobo, but no problem regarding vibration or whatsoever.