I recently put my 604's back in service after a trip to GPA with a set of their new crossovers. I was inspecting the metal diaphragm cover and noticed two slight indentations under a piece of paper backed tape. I removed the tape and it seems someone many moons ago, drilled 2 small holes in the cover for some reason. What is the best way to remedy this? epoxy, look for a new cover? Also how much would this affect the sound? Thanks in advance!!!