In my case I only want to correct room modes, not the character of the loudspeakers. For me I am not going above 250Hz. Tried 400Hz, not much difference…
For the limitations: Just to cut frequencies might not be enough. But it is good to know that this should be used with care! For me high Q factors are also problematic. It can generate pumping effects. So also this needs to be taken with care.
That‘s why I always say - try and listen…