Greets!

One more time, directivity control should be one of the main, if not the main, reason for horns in a HIFI/HT app, so did you map your room to find what sort of coverage angle is required to keep early reflections behind you?

When no super-tweeter is used, the number of cells plays a role since the smaller each cell is, the higher in frequency its cut-off, so in my limited experience, only the humongous 18 cells are truly HIFI with good control down to a low frequency and have enough discrete sources to fool our brain into summing them into a homogeneous whole.

If a horn overhangs a cab, add wings to balance it out, it will lower its F3 as a side benefit.

GM