Back when I was in college in the early 00's, I worked overhire on the local crew for several Broadway tours over the years. I don't remember which show this particular story is from, but they had a bunch of ground stacked boxes on each side of the proscenium. I remember them being purple, but I could be wrong about that. I was helping the crew stack boxes, and the touring A1 hopped on top of the stack to do the final aiming. I was on the ground, and he asked me to hand him a few "audio adjustment blocks." I looked into the case and said, "you mean these black painted 2x4 pieces?" I knew the answer, but I wanted him to say yes out loud, and he sounded a little defeated as he did.
Although sometimes I'll use spare DI's in a pinch, I prefer to use 2x4's for that job when needed. I haven't found anything better yet. I sometimes call them Audio Adjustment Blocks and think back to that show. Good memories.
