It sounds to me that the XMD3 is not working properly. If that is not the case, make sure you have it plugged in to the same imput and haven not crossed any up. I have the same radio and I thought that it only has one aux and the other are sub and amp outputs, but I could be wrong. The reason I think this is that one is grey, one is black and one is red, like I said, If I remember correctly....
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