The Achilles Heel of Line Arrays

[Think]

.......
In fact, most line arrays in homes (or small clubs), are not line arrays, as you need to have a full wavelength of length, for the signal to propagate. This is offset by the fact that in a small club, the lows are building up in the room, by room containment, but in free air, the line needs to be over 20' long to get propagation to a realistic depth of frequency. (Problems on the other end of the frequency spectrum from when you are trying to fix.)

So true, I like to think of line arrays as stack-able speakers, as you will always have some compromises with stacking, and advantages of more volume, better directionality etc. Choices... where we should not look for perfection but for the perfect compromise.

With tweeters the CTC spacing is a problem and you will get (nasty)vertical (floor/ceiling) lobbing (?), but the smaller their vertical angles, the less of a problem.

The Dayton mini planer is probably an interesting option for not to powerful line-array / stack-able speakers. Crossed a 5k it sounds great and the horizontal of axis response is superb. I have been listening to 2 of them for 5 months now and love them. They are a lot better then their price suggests. With their 3"/ 8cm of height, they are probably one of the cheapest ways to create a nice line of tweeters. They are so flat you could stick them on the front of a speaker box, probably great for builds who want to upgrade their highs.