And this is what we did , from the drivers seat ONLY ....
If you have TrueRTA (like most of us do) then it's a total breeze.
Here's how you get a spatial average:
Measure Center. Save results by going to the 'view' menu and saving or simply hit 'Alt+1'.
Move the mic about 45 degrees to the right or left of center. Mesure. Save results in #2 (Alt+2).
Move the mic to the opposite side of center (left or right). Measure. Alt+3 to save.
If you can, move the mic up about 2-3". Measure in the center. Save as #4. Alt+4.
With the mic in the same Y position (height position), move the mic left/right of center. Measure. Save. Alt+5.
Move the mic to the other side of center. Measure. Save. Alt+6.
Finally, average all the results together by doing this: Go to the 'Utilities' menu. Then 'Average'. 'Select Input': this will be #1-#6. Now 'Select Memory to use for Result': this will be #7 or whichever number you want to use. Just don't override one of your measurements.
That's it. Now, look at the difference between each singular measurement and the 'averaged' measurement. Notice the difference?
You have now measured and completed a spatial average of your system. Use this averaged measurement to tune for best results.