My only comment about test tones is that they help you quickly realize where you have peaks and valleys....as the tone progresses from 20hz to 150hz you will hear where bass becomes obvious, where there are dropout and where there are peaks. Then you can try moving the sub to different locations (if you have that flexibility) to see how things deteriorate...or improve.
In the end though, final tweaking has to be based on how the sub blends with the mains and how it sounds playing music.
In the end though, final tweaking has to be based on how the sub blends with the mains and how it sounds playing music.