I'm a little confused, I had an Marantz stereo amp for CDs which did 50 RMS. When I got the volume about half way it was ear splittingly load. Now I have a Surround sound amp which does 75 RMS, but I can get upto about the last quarter of the volume while using the same CD player, cable and connects etc. before it gets very load. Surely this isn't right according to my terrible math at half way the 75 RMS should be louder than the old 50 RMS amp. Or is it a difference between a pure stereo amp and a home cimema surround amp?