I have a Yamaha 5650 receiver and Athena Audition B1 and C1 speakers, with small sony's in the rear. I have setup my system using Sound & Vision (without an SPL meter). Things sound great. However, I notice I am changing the volume when I watch certain movies. For instance, The Two Towers is more than loud enough at -50 on the receiver, but The Brotherhood of the Wolf needed to go up to -40 or more. I have noticed this with other movies. Is this normal?