In Jerry's rig there's a speaker at the bottom of his stack, looking more like a WoS speaker, but with an interesting looking cone structure. Any ideas of what this is? Definitely not a JBL or anything else I recognize from back in the day.
You can see it in the back right of this image, right behind Billy. It's a little unclear in this shot, but at least it gives you an idea where to look when viewing the video. There's also a pretty good shot of it when the stage is being set up.