I was just given a Rockford Fosgate RFX8250 (circa 2002, made by Denon) but I was told that some type of converter or adapter is required to make the AM/FM tuner work in North America because this H/U is from Japan. Has anyone ever heard of this before //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif If so what do I need to buy to get the tuner working?