[1] Will the players mic'd and output through the PA also have stage monitors?
[2] Do they have vocals?
[1] [2]
Y N | onstage XY-90º or XY-110º
Y Y | see not onstage options
N Y | see not onstage options
N N | see not onstage options
Will you have the luxury of being there early for a soundcheck? If so, walk around and find where it sounds best to your *ears*. Then set up there.
If you're
not onstage, get close to the stage but not so close you lose quality sound from the PA* and
[1] the acoustics really suck and you can't , run XY to hgelp minimize the room.
[2] the acoustics aren't horrible, try DIN.
[3] the spot you're in sounds really good, run ORTF.
* You'll know you're too close to the stage and not far enough back for the PA when you hear the PA sound go *by* you, not *at* you.