So I failed to mark the ground terminal on my Dynaudio MD 100 tweeter when I took it apart as I want to paint the surround black (don't care for the grey). Now I find that I can't tell which is the '+' side as the speaker will go back in either way and the posts are identical. I took it's twin apart more carefully but find the opposite terminal was '+' on it's surround case. Now I'm more confused than usual. Are these tweeters not phase sensistive?