the main towers have a fixed roll off from the high 30hz region, down 3db at 25hz and down 6db at 20 hz.
the bass towers have an adjustment range for the crossover dial up to 60hz.....but the highest I've tried it is 37hz, right now it's at 35hz. I don't know how steep the roll off is exactly for the bass towers or what the settings co-relate to exactly. I do it by ear.
there are also bass gain, 'Q' and extension adjustments, as well as a low filter too which I turn off.
every adjustment is quite audible with the smallest change.
Do you realize these numbers are as "full-range" as it can be ? -3 dB down at 25 Hz is FULL RANGE.. There is no other qualifier for it .. and yet the bass towers do add something ... Full range speakers with subs is what you have