Excellent advice and ideas…gotta love this forum.
My listening room is 20’ X 28’ X 9’, and it has an additional 7’ behind the speakers with stairs to a lower level. I have no boomy issues, so perhaps the stairwell acts as a trap for low frequency reflections (that’s using my second set of speakers, which have SEAS 10” bass drivers and extend below 30Hz).
I agree that RELs and JLs are fast enough, while big and slower drivers (15”) might not work well. I’m going to demo Martin Logan’s 210 in a few days, and I’m interested in the Vandersteen 2WQs, which are new to me. Also interested in Antimode 8033 which I don’t know at all.
The Maggies deliver plenty of detail, but in my (new) experience they need to be played loud to bring it forward, so I may rethink this, as some have suggested here.
Thanks everyone.