Have to say... Reading these comments makes me even more grateful for my 14 years (and counting) gig at small performing arts center/school. Our main theater is used more for large dance productions, orchestral concerts and musicals (just did Sweeney Todd), but we do lots of band concerts (mainly jazz, some blues and rock) in the smaller "black box" studio theater. Last spring we did a Bowie tribute, featuring Bowie's longtime pianist, Mike Garson. But getting to the point...
Maybe I'm spoiled by working in such a great sounding room with seasoned pros, but I've yet to do anything approaching the types of sound checks people are referring to. Most of the time the jazz bands are pickup groups supporting a featured artist. They might roll in at 6:30 for a 7pm show. I DI 99 percent of the bassists. It's been a cross between uprights and electric basses. I've never had to eq a bass in 14 years. For that matter, the only thing that really needs some equalization is the Steinway B. I use mini condensers in the piano and keep the lid closed, so I have to make sure it doesn't feedback, so that is about the only thing I take care of. When a new group comes in, they might express some trepidation, but I've never had anything but smiles looking up at me. No complaints.
A good part of it is an excellent room. The stage takes up a good third of the room and the stage sound is a big part of the house sound. The idea of sitting out in the house laboring over a bassist's "sound" is quite foreign to me.
But I am certain that in a less acoustically correct environment, my audio nirvana might go right into the sh!tter.