I have it set to 400Hz at the moment, doubt I will go any lower than that. About the only thing it really struggles with is something like Adele, at higher volume they distort quite a bit.
Going to try getting these 4" speakers in there at some point as that will make life easier I think on both the mids and midbass.
Wavecor is also also a great choice, but their rectangular shape may not help with the size issue. The FR89EX has a tiny baffle area and squeezes in places.
OK back to the program.