LaserWriter Pro 630: Adjusting Print Density

The Users Guide for my LaserWriter Pro 630 states that I can change the print density via the LaserWriter Utility. When I attempt to change the density, I see no noticeable change in the density. Am I missing something?
The LaserWriter Utility allows you to make changes to the print density. However, the change in density is minimal and may not be visible under normal circumstances.
Published Date: Feb 20, 2012