i'm going to buy some tweeters in the near future but i need to know more info about them. I'm going to flush mount them to my door panels in my ek. do i need a cross over to wire them up or what? i'm kinda clueless. also, who makes good but still very affordable tweeters? i know good brands for subs, but not sure if it applies to tweeters,

any help is appreciated guys,
thanks,
Luke