I have owned Kestral HO's, have heard Shearwater HO's, and own Heron HO's. For a large room get the Herons. Not only do they sound better in every aspect but you really need a sub with the Kestral's and Shearwater's. A sub is definitely not necessary with Herons. The only potential problem is that the Kestrals and to a lesser extent the Shearwaters are much more forgiving of weak links in your system. Herons will make system deficienceis known. They are great speakers and way ahead of the Kestrals and Shearwaters.