Found a fix for the low-end mush in a live room

Spent three hours today tracking down a 90Hz buildup that was just wrecking the whole mix. Turned out the mains were sitting too close to the back wall — not a speaker issue, not an EQ issue, just physics being stubborn. I keep relearning that the room wins most arguments. Anyway, pulled it out and the kick drum finally sounds like a kick drum.