I need to crank my amp up to about -25db before I get decent sound. Is this normal? My speakers are: Front: Eltax Libery 5+ Centre: Eltax Centre Rears: Eltax Bipolar Also I don't seem to be getting much action from the rears. Sometimes they get awesome useage like in the Pod Race Sequence of Episode 1. I have all my speakers set to the same volume, should I set the rears to be slightly louder?