Hello, I'd like to upgrade the sound system in my Fiat. I have two MSX 165 audio system speakers, two MS165 audio system speakers, and a JBL 627F two-way speaker. Unfortunately, all the speakers are 3 ohms, and I don't know how to connect them without damaging anything. I have the original radio and I don't want to change it. What high-low converter should I choose? I need one with a remote cable for the subwoofer.