Larry,
You can try sending the bass to the M80s (Large) plus the subwoofer if you wish (it's sometimes called "double bass"). If you get too much bass (I do in my setup) with that setting, then set the M80s to Small and experiment with the crossover frequency. Try 60 Hz and even 40 Hz for the M80s and listen to the bass balance.
These rules aren't carved in stone, and depending on your room, personal preferences and speaker locations, feel free to vary the settings until you get the best overall balance.
This advice would also apply if you get the EP600.
Alan
