Hi everyone! This is more of an educational question than really a problem, so I hope you don't mind taking a second to clarify something for me! So I pretty much just have a generic brand 5.1 receiver, 2 big old mains from the 70's (Sansui), 2 JBL bookshelf surrounds, and a Sony center channel, so everything is horrifically mismatched, but it still sounds good (to me, anyways). Also, no subwoofer. But my question is.. I read in a different post somewhere in the Speaker forum about having the center channel set to Large. Currently everything is setup to what I believe to be correct, center is small, and the surrounds are small. So I thought I'd try to set all of them to Large to see what would happen. While watching a few scenes in "Matrix: Reloaded", the punching of fists sound effects had absolutely no power, or thump, or bass of any kind. When I set it back to Small, I got the big THUMP that I was looking for. My question is pretty much, why? Without a subwoofer, as I understand, bass management will come from the mains. Is this because they're set to large? I know the center channel wouldn't have very much bass at all anyways, but do they really have absolutely NO bass whatsoever? What exactly do the size settings do and control? I know I could have just asked that straight out, but I was feeling a little lonely and needed someone to talk to. LOL thanks!