This article is from the Car Audio FAQ, by Ian D. Bjorhovde (firstname.lastname@example.org) with numerous contributions by others.
People will emotionally defend their particular brand of speakers, so
asking what the "best" is is not a good idea. Besides, the best
speaker is the one which suits the application the best. In general,
however, various people have claimed excellent experiences with such
brands as Boston Acoustics, MB Quart, a/d/s/, and Polk. Also, most
people agree that you should avoid brands like Sparkomatic and Kraco at