k got like a $800 home surround/theater setup (including tv) so im not looking to get something high and mighty, just something cheap. i got a sub in the $100 speaker deal i bought off a friend but im pretty sure its not going to work with my setup. i need a sub that, the manual for my reciever says, is "powered," which i imagine is one that plugs into the wall instead of being powerd by the reciever. what is my best bet in getting one cheap? anyone have any suggestions or is my best bet buying one used on ebay or a pawn shop? my receiver is a 600w, and ive got 5 speakers currently setup. i know the center is 100w, but none of the speakers specify. they are very small (about the size of a softball, maybe a little bigger). any suggestions welcome, thanks.