"My ’room’ is a 1650 sq ft loft with really no walls and 22ft ceilings. Its not just a box, but mostly open."
That is a very big room.
"Since I have so much air to move I may be leaning more to larger drivers?"
Oh yeah. The good news is, prosound drivers well implemented can not only handle that space and still sound relaxed, they can also give you a wide sweet spot.
"Needs to have ultra wide sweet spot..."
The sweet spot can be much wider than what you get from conventional speakers. I can explain how if you would like. The tonal balance would hold up well throughout the room. Naturally imaging would be best up and down the centerline, but you’d still get a pretty good spread to the instruments from off to the side.
"...and dig deep into 30hz range or below."
Going that deep (and presumably suitably loud) in that big space does present a challenge, but imo it can be done.
"Room treatments will be an ongoing thing, but I don’t want the speaker to sound bad in the interim."
Makes sense. A grand piano probably sounds best in a well-designed recital hall, but would still sound mighty good in your big room even without treatments. Imo a speaker system should have that same characteristic.
Duke
dealer/manufacturer