I replaced my factory speakers yesterday. I put in 4" x 6" plate speakers. They didn't fit perfectly, meaning, I wasn't able to screw down all four corners, but they did fit and aren't moving or anything. Anyway, on the driver's side speaker, there was some type of small plastic device wrapped in foam in between the wire from the radio and the wire going to the speaker. Nothing was on the passenger side. Anyone have any clue what this is?