Explaining Driver Flex

[Xinn3r]

Hi, I've become a regular member here, lurking here and there, and I noticed that "Driver Flex" is one of the most annoying thing that can happen to a IEM.
 
After combing through several posts, I still don't really understand, so here's my question
What is Driver Flex? How does this happen? How to avoid/decrease driver flex?
 
EDIT: Also, a bonus question, will bumping an IEM to a hard surface (like table) cause the IEM to break overtime?

 

[50an6xy06r6n]

Quote:

Hi, I've become a regular member here, lurking here and there, and I noticed that "Driver Flex" is one of the most annoying thing that can happen to a IEM.
 
After combing through several posts, I still don't really understand, so here's my question
What is Driver Flex? How does this happen? How to avoid/decrease driver flex?
 
EDIT: Also, a bonus question, will bumping an IEM to a hard surface (like table) cause the IEM to break overtime?

Basically, as the nozzle seals with your ear, and you push it further in, pressure builds up in the IEM housing, and the pressure is partially relieved by warping the least rigid wall of that chamber, which would be the driver. This only happens on Dynamics because they have bigger drivers and armatures operate in their own sealed units, and not in the main IEM shell.
 

 

[50an6xy06r6n]

And if the IEM casing breaks, or stuff gets dislodged, yeah, you can break it.