If its not covered under warranty, find a reputable Indy shop to take a look. You really wont know till you open it up to see what kind of speaker you will be replacing (watts/ohms/size). Unless someone else here on the forums knows (there may be!).
Did your tweeter or midrange blow?
http://www.realoem.com/bmw/enUS/show...diagId=65_2458
Here is a pretty good picture of it opened up a bit;
Tweeter possibly a 4ohm, not sure on watts;
https://www.ebay.com/itm/BMW-F06-F10...ss!15122!US!-1
Same with the mid range (4ohm);
https://www.ebay.com/itm/BMW-F01-F02...pe!15122!US!-1
If mine died, I would first try to get it fixed under warranty, else I would upgrade. SonicElectronics states center speakers are 4 in & 1in. Select the "Center Dash" button at the top of the page.
https://www.sonicelectronix.com/cat_...ers-4-ohm.html
Good luck and let us know what you do!