@altman Meyer talks a bit about the Dead’s Wall of Sound, and I don’t know of they used delays (where you time speaker arrays to where they all “hit” at the same time, so your delay array’s - speakers placed 150-200 feet or so into the audience fire when the main array’s sound waves reach the delay array, which without delay timing would make the overall audio unintelligible), but Meyer said in the article I linked that if anyone wanted to replicate the Dead’s Wall of Sound, well good luck, it was first designed as an individual monitor system for 5000 seat theaters, to then scale it for 50,000 plus amphitheater with all those drivers would had been a pain in the bleedin’ hole, especially since you have to buss a buttload of outs for loudspeaker management, and if say a small amplifier array took a shit that was driving a zone of loudspeakers just for Phil Lesh’s midrange, fuck me that’s beyond my pay scale lulz.
Metallica’s last tour had all of Meyer’s latest tech, they don’t tour without Meyer, and it was very very very badass. I swear by Meyer, I love their PA.
Edit: I hadn’t built PA for a few years since I became out of commission from my accident, but one of the PA’s a built was for a small show for Rob Thomas. It was all Meyer thank God, I’ll post a couple of shots I took from that gig later (edit: scratch that, they were JBL lulz).