Guys I have a question. Do I have to have a CD changer for my stereo to work in my 95 SC300. I bought a used speaker amp (the one under the changer) but I don't have a changer and only the Sub works. The amp only has one plug in not two as is shown in this diagram http://www.intellexual.net/faq/lexusstereo.swf. I am wondering if I bought the wrong amp or if it requires the changer also, does anyone know the answer?