Depending on the impedence (resistance) of your speakers you would (I am assuming) be hooking them up parallel and halving the total. If your speakers are 8 ohm this results in a 4 ohm load to your amp. If your amp is capable of managing a 4 ohm load, these speakers would sound louder than the rest making your system unbalanced for HT. You could also run the risk of burning out the coils in the speakers if they are unprotected and the current gets too high.

Comments anyone??

Exaudio ergo cogito ergo sum