I didn't read all of your replies until after I responded the first time. Excellent advice in total. Long ago I have witnessed the inversion myself. I had cut and installed thin foam filters to fit on top of the screens. Most of them got blown off during a short run, some were hanging on by a thread. I see clip on filters that have foam wedged between two screens eliminating this problem, but I hear from you that this might very well make performance suffer. Maybe I'll just clip on the screens when parked at shows to keep people from devious behavior.
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