On my receiver you can set each speakers crossover separately and I have the front three axioms set to 100 hz. There is a setting labeled LPF of LFE which I have set to 120 hz. After a bit of back and forth between 100 on the LPF of LFE to 120 hz, I preferred the 120 hz so kept it there.

I have a pair of AV123 onix rocket rs450's towers that will be easy to lug upstairs and do an unscientific comparo.

The room is about 350 ft^2