I got a pair of 375 with bad diaphragms and dirty voice coil. I got New diaphragms and cleaned the voice coils. One driver is producing louder output then the other at certain mid range frequencies. I believe the one that is producing lower output is the one that I fully disassembled. I remove the voice coil plate and phase plug from the magnet structure. I did this because I saw companies doing so to fully restore. When I put it back together I've noticed that the phase plug set into the voice coil plate and it looks like I did not set the height correctly. I know this may sound confusing but when I put it all back together it look like the phase plug was not at the correct height above the plate. Does anyone know what the correct height setting is or how to fix?