[Fungus]

There are so many iem with multiple drivers that offer only 1 to 2 years warranty.
Do faulty drivers usually die during their early stages or suddenly die over time with no warning?

 

[Ivabign]

  There are so many iem with multiple drivers that offer only 1 to 2 years warranty.
Do faulty drivers usually die during their early stages or suddenly die over time with no warning?

Go to the Etymotic website and look up reviews for the ER-4S - you will read about owners that have had their headphones for 15-20 years with no loss of performance - now that isn't a multi-BA monstrosity, but it bodes well for the technology. Hearing aids last for years and are used by their owners all day - week in and week out. The most common cause of a BA failure is moisture, not constant use - that's why owners of hearing aids are usually given dehumidifying jars to put their HA in overnight. These things last for years (decades) if you take care of them.