watt per channel is irrevelent!!

[TrevC]

'In my old set up I had MF E10 amp with BW DM601 speakers. E10 was rated @ 40 watts per channel and it was really loud, even when we had parties I never had to go past 11 o clock on the volume knob. There was no difference in terms of loudness when I upgraded the speakers to CM5'.

You confuse gain with maximum power. Forget about the position of the volume knob, it isn't relevant to the maximum power available.