AA1268 is exactly right. You've got 5 x 7 speakers in the front doors behind the perforated area of the door panel above the window switches in addition to the round 8 inch woofers on the lower part of the door. The front 5 x 7 front speakers are different than the rear 5 x 7 speakers. The 8 inch woofers are decent, but the system lacks, in my opinion, are that the tweeters on the front 5 x 7 speakers are horrible. The sound is flat, muddy, and all base. An inexpensive fix, that will give you a lot of bang for the buck, is to replace the front 5 x 7's with a pair of Infinity speakers or other brand that has some good tweeters. As I said, I was able to accomplish that for $145 including a professional install. It really makes a big difference, especially for me, because I like a lot of treble, as well as bass, when listening to music.
2012 MUSTANG GT PREMIUM A/T, BLACK W/ SADDLEBROWN INTERIOR, HID LAMPS, SALEEN GRILLE, 19" PREMIUM WHEELS, QUARTER WINDOW LOUVERS, GT 500 AXELBACK MUFFLERS, K & N FILTER.