Updated 3/8: adding a pair of #31 subs from REL in an effort to deal with room modes and the large volume.
I’m trying different configurations and am getting closer to a settled position. Speakers are now playing to 23hz (though down in output), but a major cancellation occurs around 40 hz. Above 50, things are terrific. Regardless, I finally have a room that remains relatively inert even at big crescendos.
I’ve tried other switches, though certainly not all. Nevertheless, some of those were direct competitors (price wise) to this, but had limited beneficial impact. The Reiki was notably better such that it was worth the investment.