My goal was not to make a proper crossover, but rather to convince myself a crossover existed that would reasonably blend the upper three drivers (I’ve already decided it will be at least bi-amped) and have an acceptable impedance curve. I’ve been worried about the latter given that most drivers these days are 4 ohm and it is almost impossible to find any drivers over 8 ohms. Here is what I ended up with – a 4th order LR @ 2.2kHz and the super tweeter coming in at about 13kHz, 1st order.
The frequency response is quite acceptable, with the only major glitch being the notch at about 1.4kHz. That is in the woofer response and not a crossover anomaly. I’d have to look at a lower crossover point and/or a gentler slope to allow the tweeters to help fill that in. We’ll see. The impedance stays above 5 ohms until about 13kHz, so it shouldn’t be a difficult a load.
So I’d say mission accomplished.