Anyone who owns a pdr 12 can help. Five days ago, I purchased a new PDR 12, hooked it up and noticed that there was a slight rattle coming from it. I kept it thinking that it might go away, but it persisted. Today I returned it and exchanged it for a new one, but the new one also has the same rattle. Do all pdr 12's do this? Or did i just pick out to bad pdr's?