Was just curious here, I currently have an AM radio only in the K5 and seems like I only have one speaker (in the middle of the dash). I can see the speaker pin holes for the right and left on the dash but no sound comes from there. Do I just have one speaker then or did the AM radios just use the center speaker? If I do just have one speaker, could I put two more on each side ... again I have the pin holes, which leads me to believe that speakers are suppose to go there, as well as the wiring should be there too???