Dont think with full PA support the sound engineers stacked all of the PA cabs vertically as mirror image just to get best balanced disperion in the house addressed to each listener in the audienceTitle pretty much says it but I’ll elaborate. My bands been playing originals gigs with full PA provided by the venues for 17 years.
Seriously you'll get a similar disperion FOH with your bass cabs as you allready experienced with full PA support. Regarding (claimed) delay issues the laws of acoustic science don't distinguish very mutch between full PA and MI bass cabinets.
Btw, may be I actually should stack all of my PA cabs vertical or at least as narrow as possible rather than left and right stage sided just to have best dispersion FOH for vocals and keys and drum kit and 6-string and the bass guitar for sure (just kidding)
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