I played with the Edifier X600 before You start to get distortion when you crank the volume up to ~60% As for the bass, strong enough in it's class but the accuracy is very poor. It is slightly better treble and mid range compared to Z-640. However the Z-640 totally pwns X600 when it comes to bass. No match at all, both power and accuracy wise.
Saw Klipsch yesterday.. Promedia GFX 2.1. Looks good and the bass is deep and tight enough. Didn't crank it up coz the boss is talking to a client. Was looking for mousepad. Found out that none of the shop in the complex sell a decent mousepad.
This is the one I'm looking at now... http://www.infinitysystems.com/homeaudio/product_detail.aspx?prod=PRIMUS150BKS Sorry for going off topic.
I went around Puchong to look for the stupid distributor, we took more than 1 hour to find the shop!!! And it couldn't get worse, they shifted somewhere!!!
i just bought a 2nd hand AL 621!! the sub will sound boomy if set above 60% level. overall it's v good, above ave sound!!