tweeters

Howdy y'all, I'm fairly certain my cabrio doesn't have the tweeters/other fun prizes that come with the upgraded sound system. Would it be a waste of time/money to replace the stock door speakers without adding tweeters or a subwoofer? My main goal is to make sound from aux sources have clearer...

I want to replace the door speakers and add an additional pair of tweeters in the door. I purchased a POLK AUDIO DB6501 6.5" COMPONENT system which comes with a pair of 6.5" speakers for the door, a pair of tweeters (which I'll also mount on the door), and two crossovers. My question is that...