Roy gave me this very sensible response to the coincident driver issue: "Regarding co-incident drivers: Any 1" dome tweeter, below 5kHz, wants to radiate in an omni-directional pattern. This means that much of the sound you would hear from a co-axial mid/tweeter driver in the lower treble comes to you secondarily by way of bouncing off of that mid's cone. Even a short horn around the tweeter cannot prevent this (because it is short). A high-order crossover can help reduce that secondary 'splash' off the mid's cone, by chopping off the low-end of the tweeter even more rapidly."
Hopefully he wouldn't mind me posting it (can't see why not).
Hopefully he wouldn't mind me posting it (can't see why not).