Hi, my apologies for the confusion–the range is for the range of crossover values your speakers will work with, but in all cases a fixed value is what you would want. For your system, you can set all the speakers at 80Hz and you will get great sound from the system. Also, set speakers impedance to 6 ohms, and "normal," for speaker type. LPF of LFE should also be 80Hz. But, I think that's everything! Lemme know if you have any other settings you need help with.