First off thanks for starting this thread. I have been using my 7's for a few years now. I would love to hear more about upgrades in the mid-horn and top horn. I have tried quite a number of amps (2a3, variety of vintage push pull and some midfi solid state) and my conclusion is that class D is the best with the 2226. I pulled a Behringer dsp3000 from my sub recently. It was a major improvement, probably due the class D and sheer wattage. I plan to purchase another Behringer and biamp the system next.