The only real problem with mixing speakers is voice matching, speakers all sound a little different with the same power and source. If you buy the same brand and line of a high quality speaker they should be voice matched, meaning they will sound just like each other.
This usually isn't a big deal in the normal car setup for a couple of reasons:
Most people can't hear the difference anyway.
In a car you have more noise that will muddy up the music, so it's even harder to tell the difference.
Speaker locations in a car are not exactly ideal.
It's really just a matter of your listening preference, If you are a music connosuier(sp?) listen to some other systems and see what you like.
If you are going to externally power the speakers be sure to use a crossover, that is best way to get crisp sound from all your speakers, then they only produce the frequencies they were made for.
Sorry for being so long but stereos are my second favorite thing.
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