There have been several discussions lately in the ChurchSoundcheck Discussion Group on the topic of measuring sound systems and acoustics. It's been an interesting topic to consider. One issue that has been hard to convey through simple text is the idea of resolution. Hopefully the graphics in this article will help you visualize what people have been talking about.
Resolution determines the ability to see fine details in the measurement.
Consider this analogy. If you look at a leaf on a tree several feet away from you, you can appreciate its beauty but you really can't see any detail. You can walk up close to that tree, hold that leaf in your hand and look at it very closely and of course start to see the detail of its shape. Put that same leaf under a microscope and you'll see significantly more detail. Each view provides you with information.