These are affordable systems that are well designed systems. It's not just a Spiritual reason for good sound, it also makes economic stewartship. The following tests will let you know the strengths and weakness of a church sound system and its acoustics. The following in a partial explanation of each test. The NC or Noise Control level of the church describes the background noise in the sanctuary.
Background noise has profound implications.
Here is one of the main problems with high levels of noise. We often use 60dB as an average. To hear speech at a comfortable level and to be able to understand the words being spoken, the level of speech usually has to be 25dB above the noise. Since the quiet side of speech is about 55dB, a room with a noise floor less that NC30 is an excellent listening space. The most common places that have such low NC ratings are bedrooms and living rooms that are away from kitchen noises.