All the crap everyone is linking you to is just rebadged cheap *** pro audio speakers. Horns are actual compression drivers used in pro audio mounted to horns that will fit into a car. I can tell you from first hand experience a set of horns when sound better than a bunch of tweeters in the car and it will also be capable of getting louder. Get the horn bodies from eric and a budget set of compression drivers if pricing is that big of deal. That's if you want it to keep up the best it actaully can and have a better SQ. Plenty of people throw a bunch of cheap crescendo and prv mids in teh doors, it does get louder in the focal range than standard car audio components, but that's all the positive I can honestly say and I heard a LOT of cars this year at slam. IF your only goal is to keep up and hear words and you want your build to be standard, do what all the SPL guys do who put in front speakers as an afterthought. Guys at
DIYMA know a lot more about full range music playback and are guiding you based on their goals, which are somewhat differerent since they are mostly SQ oriented.. Doesnt' mean a single set of horns cant' outdo a **** ton of $15 bullet tweeters.