I purchased two Intimus 532-LR's, an Intimus 422-C for my center and one for my rear. I purchased 80 percent volume when I'm listening to movies and music. It's up pretty loud, but I can go louder. This receiver puts out 95watts per channel. It just doesn't seem normal that I should have to push it to 80 percent to get the sound I'm getting. Do I need an amp or something? I'm concerned about pushing the receiver that much on a regular basis. Also, I've got the 10" sub. I think my house has moved of the foundation now. Great sub and great all around sound. Do I need an amp? If so, any suggestions? Thanks!