Last night I played at a venue that had an "insta-stage." It was a sturdy unfoldable thing that came in a few segments and held up the band's weigh solidly. Trouble was, it robbed- no, defeated- my low end. We were also projecting into a pretty big room maybe 15' high, 35x50. I use 2 4x10s and a 300 watt tube amp. You figure I'd be set. The whole show (which was 2 45 minute sets, 1 1/2 hours) I was trying to fix my sound. We still put on a good performance (a few drinks during the intermission cooled me off and improved my stage moves later on) but Insta Stage kicked my ass.