I' am just trying to make my Control 1Xtreme to closest to the orginal Control 1 so that's why I want polycarbonate tweeters instead of titanium laminate. I have already measued the the orginal Control 1 tweeters and woofers and mine and they are exactly the same size. I don't know why JBL says the woofers are 4in but they are acutaly same as the orginal one that is 5in. I just they just measured them differently like maybe they measured from the rims or maybe the foam part ot the frames of the woofers but eather way thay are exactly the same speakers. I talked to JBL tech and they said that the Xtremes where basical a newer version of the orginal and they made the Xtremes since they were soo popular. They have made some improvements in the Xtremes too like adding titanium instead of polycarbonate. Other than that they are same speakers just measured different than orginal. Anyways I prefer the old tweeters since the highs are not soo harsh as titaniums are. That's why I just wanted to swap tweeters with the orginal Control 1 and my Xtremes.

I don't have the orginal Control 1 anymore I just remembered that I have just measured them before and they were same size. I just know that when I talked to the tech guys at Orange County Speaker and they said that if the crossovers only different in the two is one being 6000hz and other one is 4000hz it will be perfectly fine meaning putting the polycarbonate tweeters on a 4000hz is ok.