The little box has capacitors to block low frequencies from the tweeters.I installed the Hansshow DIY harness, it has a small box which I am guessing has caps for the tweeters?
I am also wondering the difference between the Basenor , Tesla offer and Hansshow harnesses...
I see the Basenor has a T harness beside the seat.
I plan on modding it to add an Alpine Amp and am curious of the differences
The plug at the base of the passenger b-pillar on the Basenor harness is how they get sound to both overhead tweeters and the drivers side mirror tweeter. The Teslaoffer harness uses the same method. Hansshow instead runs wires under the center console to a different plug in the driver footwell for both of the overhead tweeters and also to the driver side mirror tweeter.