This high-output horn tweeter kit is a great addition to the Vanderhall Roadster, and will connect to any audio system that has been previously installed, including the JMC ROKKER audio system. These tweeters add audio clarity to the music being played, especially at high speeds where the wind and road noises begin to drown out the details. Tweeters can be mounted into the inside lower forward doorsills as shown, using a standard 3” metal hole saw. Plug-n-play wiring harnesses are also included to connect in series with the wire spades on the back of the stock kick-panel mounted speakers.