s550 hv option that can switch from 2 channel to 5 channel..u can choose 2 channel when listening music, switching to 5 channel for playing games and watch movie..
s550 bass not tat strong than s730..but can consider model
Edifier AudioPro S5.1 MK2...is 5.1 channel...ultimate version(combination s550 and s730..hehe...)...but i dun know got sale at malaysia...