if your buying components,need to remove tweeters,if your buying co-axials d/c your tweeters then fit em,13cm all round
Reason for removing the tweeters is that a coaxial speaker has a tweeter attached to the speaker. Typically sits in the middle of it.
Components have a separate mid range and tweeter with a crossover. So you replace the tweeter with the new one.
Either way you disconnect the tweeter, you don't want 4 tweeters up front it just doesn't sound right.
probably be like driving round with tinnitus lol