any benefit to having 3 or even 4 way speakers in the door or rear package shelf? i want to upgrade the amp and replace all the factory speakers.... would having a 3 or 4 way speaker improve the sound of the stereo? was are the cons of having a 3 or 4 way over a 2 way?

also what is the size of the tweeters so i can look them up for replacement

 

bump... no one?