I have just bought a '98 accord coupe. It had installed in it a Clarion tv/cd/tape system. It is a very nice system, and the unit seems to work fine. The problem is that both the left midrange speker and the left tweater don't work. I have already taken out the unit and checked all of the connections, they seems to be fine. Can i get some advice on what i could do to fix the problem or how i should proceed in troubleshooting it?