All A level sections are located in the lower level just off the floor. Section 2A will give you an unobstructed view of the stage from a head-on location. Many concert-goers enjoy seats like these because they provide a comfortable view of the stage without any neck-turning.
For concerts at the Tacoma Dome, row 9 is actually the 6th row from the floor in section 2A. One drawback to being so close is that the seats do not rise as much from the floor as they do in the lower rows. Thus, you may have some issues if tall fans are in front of you or if others decide to stand (and you do not want to).
Finally, seat 29 will be the second seat from the left aisle. This will allow you to easily navigate up the stairs to the concourse.