Learned: 2.1 speaker + 2 more speakers = 4.1 speaker system?

So, "2.1 + 2 != 4.1" !

By TheCorm

2.1 + 2 would be 4.1 but the rear speakers obviously would have less bass because they don't have the benfit of a subwoofer.

Therefore in EAX enabled games, an explosion in front of you will have much more of a "BOOM" than explosions behind you.

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2.1 speaker setup 2 more speakers = 4.1 speaker system? - AnandTech Forums