I bought my Mark IV Fraziers in 1973. In 2001 I gave them to my son-in-law. Last fall I decided I would build a set of my own and I'm at a point of needing some tech assistance on the cross over. There are two foiled caps along with what appears to be some sort of coil inside. Only markings on it is 2.25. Question is what is it and is there a work around. Is it some sort of an inductor? I have pictures of it if needed but I would need to reformat them as they're too big.