There may be a possibility that my speaker driver has some dirt in the voice coil gap. Does anyone know what might be a way to clean it out without any disassembly?

Thank you.  It is the FRX driver. One of them has a very reduced volume. I was hoping that there would be a simple answer, but the more that I evaluate the problem, the more it seems to be an internal issue like maybe with a connection on the secondary coil or something. There is no rubbing sound and the cone seems to move freely. The other driver in comparison sounds fantastic, right out of the box.....