Forgive me for this dumb question... I am planning a budget conscious home theater system and am looking at the Onkyo TX-DS494 receiver which is conservatively rated at 55 watts per channel x 5. If I am listening to music CDs using only the front two speakers, am I still only gettings 55 watts per channel or is the power that is not being sent to the surrounds and center speaker available to drive the front speakers (i.e., ~137.5 watts per channel)? Having never had a home theater system, I don't really know how this works. Thanks.