To expound on that last item, I've been talking with Keith Larson a lot lately and I'm very excited about this process. He has written software that improves on Spice models by allowing actual driver impedance to be used as a component. My Spice models for π Speaker crossovers model the driver as a complex load with Re, Le and tank circuits to model mechanical and/or acoustic resonance. They're pretty good models, certainly much better than what you get using a fixed resistance as a load value. But the ability to substitute an actual impedance chart goes a step beyond that and will let me have better visibility of the actual behavior of the circuit. With this improved visibility, I may be able to further optimize the crossovers.

I've started making measurements of the drivers on various horns, so you can download them here and follow along in the process, if you're interested.

• ZMA Files