If it was my project ( & because I like large format drivers on round horns ) ,
- I would run the 2441s all the up to a fairly linear point ( say 10 to 12K ) on that horn . I would do this even if it meant the creation of a HF compensation circuit ( hopefully not needed ) and the insertion of a series LCR notch filter strapped across the driver.
- I'd also first try out a gentler slope in lowpass section of the bandpass on the midrange horn ( I'd attempt to add the natural 6 db acoustic rolloff in the HF to the 6 db electrical rolloff ).
- Note: To be able to use a ( Speaker Level ) LCR you would need to add a 12 to 16 ohm inline resistor so that the LCR notch could actually resonate & then attenuate .
- Then I would cross the 2404 in with a 3 or 4 pole ( speaker level ) circuit . I would create either a classic 3 or 4 pole filter. Or maybe 3 pole "bump filter" which has a bit of EQ in it ( resonant bump filter ). JBL has shown the way in how they used to employ these resonant filters on UHF devices within their "Legacy" 43xx ( big box ) products.