FWIW---> ONE (of the many) fine attributes of my recently purchased Intuitive Design Summits is a wiiiiddde sweet spot, with at least some preservation of central imaging even when seated outside of both speakers (yes, really). These are a two way dynamic design with 7" and 1" drivers and a transmission line, so don't know about how large of a room they could "fill", but do an astonishingly wonderful job thereof in our main living room, which is reasonably large, and is open to the kitchen, etc. The ceilings are not particularly high, though.
We also have a Rel Storm 3 sub-bass unit, although these Summits do pretty well on their own. Dale Pitcher told me that their rolloff is around 40 hertz, and from what I can hear, that sounds about right; accordingly, the switchable crossover frequency on the Rel sub-bass unit is set fairly low.
We also have a Rel Storm 3 sub-bass unit, although these Summits do pretty well on their own. Dale Pitcher told me that their rolloff is around 40 hertz, and from what I can hear, that sounds about right; accordingly, the switchable crossover frequency on the Rel sub-bass unit is set fairly low.