I was curious about level setting, well matching actually, and how it is depicted in REW. Let's say after level setting your tweeters by ear, you pull up REW and run separate RTA's for both left and right tweeter. You match the two and they are overlayed on top of each other almost perfectly. Is that confirmation that you have your levels set correctly as the left-right tweeters relate to one another (not as the tweeters relate to your other speakers)? Maybe short of small 1/4 decibel adjustments to fine tune.