They might be able to do it, but the RS meter is easy to use, relatively inexpensive, and you know your system is correct. Personally, I've always thought that calibration is easier with the RS meter. Supposedly, people have a hard time distinguishing 3db. What this means is that you might have the center channel 2 db above the right speaker, but the left speaker 2db down from the left speaker, and you'd have a 4db difference between the center channel and the left speaker, which would be noticeable. This is a simple example, but you can see where this could be an issue.