When a dynamic driver IEM is concerned (or Hybrid) in an air tight enclosure and you push the IEM into your ear air cannot escape, it has nowhere else to go but down the nozzle then have a push/pull effect on the dynamic drivers diaphragm making it "flex", usually past its normal threshold.
The result is a crinkling sound in your ear or sometimes a 'pop' sound. In some cases if the driver flexes too much you may lose sound temporarily until you readjust it (reseat the IEM). Monster Turbine series are rather plagued with the problem. Some companies try to avoid this by adding a tiny hole in the housing so air can escape before hitting the driver.
The best way to avoid it is by reaching over lifting your ear during insertion so you don't push the IEM in like a plunger effect. A lot of it can be cured by prevention.
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