i've had these er6i's for a long time & i think the left driver is dying. i'm not extremely familiar with the life cycle of a balanced armature, but what are some of the symptoms when they are just about at the end of their lifespan? i did put my meter on them and they are no where close to...

well it looks like ety finally discontinued the ER38-50E filters. does anyone know the acoustic resistance of these? i'm probably going to have to find another source but would like to match the resistance if possible. it's these little white ones. for the er6i, er22 & i believe the old...