I am trying to install a 6.5" component system in the doors of my 03 elantra 4 door and i noticed when i got door panels off that there is an unused speaker connection taped together with the speaker wire/connection that is going down to the factory 6.5" speakers. i used an old speaker and touched the posts to the connector and got music! Is this an unused connection for an optional tweeter? My car didnt come with tweeters but maybe it was an option that year? Any help would be greatly appreciated. And if safe, that would make my install alot easier.