Buy crossovers separate?

Tallyman89
Tallyman89 Posts: 1
edited December 2011 in Troubleshooting
I am using Polk MM6501 in the front doors of my truck. Every once in a while the left side cuts out. I have double checked the connections and could not find anything loose. I am wondering if I might have a faulty crossover. Does anyone know if crossovers can be bought separate? Thanks