Great read but what a drastic difference concerning "enough rig for the gig". Would be interesting to know how truly effective that rig was for the size of the venue. By todays standards, that would be a rig for about 2000 people. Would be an even greater "debate-starter" if it was deemed to have worked just fine. Certainly the folks in the front-third or so could probably hear just fine, what about the back 40?
One thing that many/most people forget-is that the "gig" was not supposed to be that large. The system was designed for a much smaller crowd-but the event grew.
As Bill Hanley tols us once-there were delay towers out in the crowd. But they weren't used-because something happened with the tape deck that was going to be used as a delay device.
ALso the SPL levels of concerts back then was not as loud as today. Probably because they couldn't get as loud as we can. Lack of large amps and high power capacity loudspeakers. Remember that a 300 watt/channel amp was a VERY LARGE amp back then.
My first systems were run on lots of 100 watt amps that I built. I remember when I got my first BIG amp-a Peavey CS800. I felt I had "arrived" and that would be all the power I would ever need for bass. And I was doing mostly hard rock at the time. Oh how the times have changed. Before long it wasn't enough to do monitors well.