What Brand Of Door Speakers - F150

Are you sure they don't sound bad because of some other reason? Alpine CD players have alot of procesing so you might want to mess around with it more. Did you wire your speakers in phase?

I too would check the phase of all the speakers first, then if that checks out, I like the MB Quart speakers. Don't expect tons of bottom end from them. If you go for component speakers you can indeed fit oversize 6.5" woofers in the doors like the MB Quarts. A mounting template will need to be made to do this which is fairly easy to do. They will not play as loud as the coax's will but they sound better for the most part. If you are adding an amp in the future, do the coax route in the back and the components in the front.

ohhhhh boy, my favorite pet peeve...harness hackers!   If your going to be adding an amp in the future, your going to have to ( or should) re wire anyways, so you may as whell do it now directly from the speakers to the headunit, that way theres no confusion and wot not.  And in the future when you get your speaker amp, just run some speaker wires with your rca wires from your amp to behind the headunit and solder them together.

As for the headunit, how do you have it set up, center frequency? crossovers? is the time alignment set properly?

What sounds wrong with them?  Theres going to be a lack of bass no matter what, aftermarket speakers are usually designed with a subwoofer in mind.

To check phase/and polarity at the same time get yourself a 9v battery, put a wire on the + and a wire on the -, tape them down snug.  Now take that battery and tap the speaker wires.  If your speakers polarity is wores correctly your speaker should pop outwards when you touch the + from the battery to the + on the wire harness, , , if it pops in, then you have the wires backwards.

As for deck set up, i reccomend crossing over the speakers between 80-120hz, setting the mid senter frequencie to around 200 hz no more than level 2 on boost or cut depending on how it sounds.  And for the tweeter center frequencie play that by ear.