Originally Posted by DukeLeJeune
If a speaker has a significant cancellation dip in the crossover region on-axis, then it has a design problem, in my opinion. But if you go far enough off-axis vertically (for horizontally aligned drivers) you are likely to find a cancellation dip even if the on-axis response is smooth.
I found exactly that problem, so I had a word with a boat builder mate (steady some of my best friends are boatbuilders) and gave him some drawings of some old wooden Vitavox 220 Hz multicellular horns and hey presto he whittled me up a pair:
which I have in at 24 dB @ 300Hz they are still going strong at 17.5 kHz so I don't have any crossover overlaps or off axis effects in the band around 1kHz to 3kHz where I am most sensitive about it.
Still I don't think the fearful boys would want you to fiddle about making anything that complex.
With the Coral M 105 driver and the JBL titanium diaphragm, I get just under 111dB 1 watt 1 mtr. So I don't need many midrange watts at all.