Distributed Bass Array configuration

I think its a fallacy if some are asserting setting up multiple subs properly is easier than one. That’s pretty simple math. You now have more adjustments to deal with and each one has some effect on the resulting sound. You can gloss that over to whatever extent desired but you can’t deny the facts.

I agree, using the 'throwing darts' method isn't the way I'd install a $3200 subwoofer system.

Why is there never any mention of level matching these DBA systems with the main speakers using an SPL meter?

There is. All over the place. I've never done it. I listen with ears, not meters. So why would I care what a meter wants?

Otherwise, wouldn’t it just be guessing what the volume level should be on the subs?

Is that really what you think? Do you "guess" what volume level you like? "I think I'll try 12 today. Wow that's way too loud! Guess I'll try 4?" Is that what you do? Of course not. You know perfectly well what volume you want. So why would subs be any different?

Otherwise, wouldn’t it just be guessing what the volume level should be on the subs?

For some Way Too Much isn't enough.