Bought to replace the head unit on my 2004 Maxim with a factory Bose system. I've read that some of the other cheaper cable adapters didn't work properly with the Bose system depending on the RCA output voltage of your head units. Instead of messing around with the 'unknown', I spent the extra money and bought this device. Wow, it couldn't be easier! Simply connect the colored wires to the main unit (we used the positive high wires and just left the low wires unused) and plug the other end of the adapter into the stock connectors and you're done! Sounded better than the factory Bose unit without the volume issues of cheaper adapters. Brilliant!