Good job on sharing this article. I am high on "actives" having been down many "passive" roads.
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Yes, there are large active speakers. The KRK VXT8 would easily accommodate large rooms. Actually, the VXT6 (which I used in a desktop system for several years) works well in typical living rooms.
Many choices can be found here: http://www.bhphotovideo.com/c/buy/Studio-Monitors/ci/8617/N/4294550597
I have not run across any active speakers that use class D amps. Of the 4 pairs I've owned, all were class A/B.