I was at the 78 Boston Music Hall shows, too. Was really psyched to get to see the band again in a small venue but the shows themselves were pretty lackluster. Security was really obnoxious and it took forever to get in each night, I saw them checking peoples wallets for, I guess, drugs. Each night the show started before everyone could get in. I skipped Giants Stadium since I didn't like going to shows in stadiums, made an exception for Dylan and the Dead, though.
Somehow I never paid that much attention to the equipment at 70s shows except watching the evolution of the "Wall of Sound", the individual components weren't a point of focus for me just the visual aspect and the sound of the music. I did pay attention to the instruments themselves, though, especially Big Brown, Mission Control and the Wolf guitar and the oscilloscope Phil used to have on stage was hard to miss.