Ok folks, have set all speakers to small on the amp. The amp doesn't allow me to play around with the frequencies only to adjust small to large. My pro 50's crossover ranges from 40 - 240 and i have currently set it to max (240). Noticeable bass difference and clearer higher frequencies. My final (hopefully) question - Does this set up sound ok and by putting crossover on amp to 240 am i robbing my floorstanding M73 fronts of anything? Cheers again.