I looked for books on this fairly recently and didn't find any.

It amazes me that at concerts we can have a megawatt power plant at one end of the system and the fragile human hearing apparatus at the other, and there are no dials to make sure that the power coming through is not dangerously loud. At least, the last time I checked, the sound board had no dial registering the decibel level going out.

CharleyF, I have two suggestions: the manuals for the equipment being used and the customer service departments for the manufacturers.
You also might check with local university theatre and music departments for courses.