I hear you Adrian. What you are saying is mirrored by what people say on the Klipsch forum. They use a SET on the mid and class A or D on the woofers and tweeter. Where you cross the woofers may be a key component. I think they are crossing around 300 hertz or below. Where do you cross yours?
I also hear many others say use the same amp.
On my speaker, I could see using a stereo amp vertically on the woofers and midrange. Then maybe a class D on the horn tweeter.
I have talked to Merchand. He needs all the points, slopes etc. My thought was a digital with infinite control to figure it out. Then get an active analog once the values are known.