What defines good sound? While some might argue that the concept is subjective, there are certain aspects of a good sound system that we can all agree on. Spoken word should be intelligible. Musical performance should be clear and full-range. And sound should be consistent, everywhere in the house.
Of course, addressing these goals will vary widely from one church to another. Are you welcoming your flock in a 1,000-seat sanctuary? Clearly, your needs will differ from a congregation meeting in a 300-seat chapel, an auditorium, or a converted warehouse space.