You can't just put tweeters 'anywhere', they need to be imaged properly to get the correct sound outta them. Looking at your setup, they're just pointing straight ahead...they both need to be directed to an imaginary point (usually the center) to produce the correct sound stage. If I were you, I'd move the tweeters to each side of the car and then point it to the center passenger seat. As well, try to keep them no more than 1 foot away from the rear speakers.
Subwoofers are non-directional; they can go wherever you want. Tweeters produce directional sounds, they have to be placed carefully.
Subwoofers are non-directional; they can go wherever you want. Tweeters produce directional sounds, they have to be placed carefully.