I didn't have a problem with it. It was just the first time I've experienced it in all my years of playing. And it was in a written directive to not move anything onstage. The sound guys were decent but not the best I've ever worked with. Took a LOT of tweaking during soundcheck. And for some reason, they had the treble on my bass signal in the monitors maxed! Yeesh! And they had the kick drum on overdrive! Thought Godzilla was in the house!
Me: "Uh guys.....can y'all back off on the treble......a LOT! And balance out the bass to kick drum mix! Thanks!"
How big was this stage?....layout?
That monitor thing seems pretty whacked. Like they're unfamiliar with the system or just don't have a good starting point to adjust knobs (like somewhat "down"
Depending on the layout, sidefiring can be a proactive way to keep levels in check. When somebodys rig is blasting their own ears instead of everyone elses, they'll usually turn down a bit on their own.

