E90 2011 door mirror mounter tweeter

[gkltsp]

Dear SifusI am an owner of a new E90 320i with idrive. I notice that the tweeters mounted on the wing mirror panel for on the left and right is different. On the left its blue in colour , what looks like the magnetic portion facing outwards and the right looks normal like any other tweeter. Soundwise i can hear the trebble from the right tweeter but i cannot hear it on the left tweeter.my question is is it intentionally done this way due to ICE set up that i am unaware? or did somebody make a mistake during assembly of fixing the left tweeterany input is highly appreciated.thanks