As I mentioned earlier, this project was conceptualized as a three-way design. The crossover points that I finally settled on were 550 Hz and 2.5 kHz. These points allow both the midrange and tweeter to operate fairly stress-free. The crossover slopes are second order, though as you can see it took quite a few components to hit these acoustic slopes, especially on the midrange.

The woofer crossover is straightforward enough due to the low crossover point, and the second order electrical filter does indeed produce a second order acoustic roll-off.

The midrange however, is another story. Second order electrical filters provide the majority of the filtering, but these are supported by a resonance notch filter on the low end and an impedance compensation network on the high end. In addition, a high-frequency trap of sorts is added on the shunt leg of the low-pass filter, which helps to tame the large breakup peak around 10 kHz. A padding resistor is also included to reduce the output by a decibel or two, but it also helps keep the impedance from dipping too low.

The tweeter uses a second order filter, a slight bit of padding, and an impedance compensation circuit to help flatten the response. I found the impedance compensation circuit to also help keep the top octave from drooping quite as much.

I will mention that the net impedance of these speakers is reasonably low, and these speakers definitely qualify as 4 ohm speakers. On the positive side, the speakers may only dip below 3 ohms for a brief range, so shouldn't be hard to drive with a 4 ohm stable amplifier.