I have a set of cabs (115,410) that have the full 3/4 inch plywood or, whatever it is, sides. There are cabs that are made of much thinner stock and are considerably lighter. Has anyone ever done a side by side comparison? Do the thinner, lighter cabs have the same thump? Thanks, I have tried a bunch of smaller cabs in the reasonable price range and none of them can handle the low E of my upright at big volume, so I'm stickin with Ampeg.