Glad to hear of the positive results. I was hoping to be able to use one of the AE drivers in my upcoming speaker project - I think I now know what the project will be. It sounds from your description that the 3 Pi with the AE driver would be (very) SET amp friendly, yes?
The AE vs JBL comparo would be interesting. I will be waiting quietly for the results of this as well. Would I be assuming correctly that you have no plans for using AE drivers as an upgrade path for the 4 Pi? Or, have recent tests on the AE encouraged you to possibly look into it further?
Thank you for all your effort in researching and sharing results with us, and also for brining quality hi-eff designs within reach of us mere mortals