well i have a set of 5.1 sbs 560(yeh not the best but was only £17 ) but i notice that the front right/rear right are atleast double the volume of the left front/rear, i have the control panel thing and if i set both to max all i can hear is the right, if i mute the right i can barely hear my music etc. The difference from having the right on and the left is about 90% id say, incredibly loud the right is but the left its almost silent. Any ideas? they are still in warranty so perhaps it could be a hardware issue? it is pluged into a soundblaster 2 ZS, will try with onboard sound a bit.
also the center is just slightly louder than the left, hard to hear still.