Sonically I'm getting good results, though I'm still not satisfied that I actually understand the process. And rabbit holes being what they are, I can't resist fiddling until I'm confident that I understand what I'm doing. I'm hoping that you kind folks will indulge me again as I run through what I understand to be going on, along with a couple questions along the way. Here 's the scenario and my logic (???):
- Layout: Sub 1 is in front right corner about 3ft behind right spkr. MLP is about 14ft away from sub 1. Sub 2 is in rear left corner and about 8ft away from MLP.
- Sub 1 REW timing measurement is -1.44ms. This means that the mains need a 1.44ms delay to be time aligned with the front sub at mike position/MLP.
- Sub 2 REW timing is 3.19ms. This means that signal arrives at MLP 3.19ms before timing signal from the mains. And that further means that the rear sub needs 3.19ms delay for signal to arrive at MLP at the same time as the mains.
- Since both subs are now aligned with the mains per above it follows that they're necessarily aligned with each other.