If you want to run all 10 speakers with the 50.5, you would almost certainly need a separate amp to run your r/l/c channels. A receiver's rated output (130w for the 50.5) is usually only a stereo rating. If you want were to run 10 speakers, you're probably going to end up closer 50-60 watts per channel in reality. That's fine for the surrounds, but I would want a dedicated amp for those 100's in that scenario. In your current setup you would probably need a 250w amp to the 100's to realize a significant improvement. My 2 cents.