Ok I have done a lot of reading on the subject and still few things confuse me. The questions would be in detail as I have to make them specific to my system. I have the following setup: A/V Receiver: Yamaha RX-V463 (105 watts per channel) Infinity P250 fronts (150 watts, 92db sensitivity) Infinity P150 rear surround (100 watts, 88db sensitivity) Infinity C25 Center (100 watts, 90db sensitivity) Infinity PS* Sub (100 watts) I have connected the setup to my PC through SPDIF digital output on my audigy card. I use winamp for music. The amp has volume threshold from -80 to +16 and right now I have fixed the volume at -20. I control the volume from my PC. Usually for movies i have to turn up the volume to -15 or sometimes -10 as the SPDIF disables the volume control from the PC. My question is, at -20 how much amplifier power am I actually using to drive the speakers? Do I run the risk of clipping them at this level? Other than the main volume, each speaker's volume can be adjusted. The threshold is -10 to +10. I have kept the surround speakers at +7 and while watching movies I turn up the center to +6. How does this effect the overall volume? One last question, how does speaker sensitivity reflects at different volume levels on the amp? Say at -20db on the amp, what relationship does it have with the 92db speaker sensitivity of my fronts? Would appreciate if someone can clarify these queries.