jsk ksj
1000+ Head-Fier
I cannot find any diagram of thay part of the iem. I would be very surprised if this is any sort of vent, as one big criticism some have of the ier-m9 is that they are not vented & some experience a vacuum pai after prolonged use. I have never experienced this personally.I thought so as well. I was quite lucky to find the rubber plug - I noticed the hole on the left earbud and found the plug on my bed. Again, sorry for my poor camera skills but this is what it looks like:
TIA!
I think you are safe to glue back. If you want to be extra cautious, block the hole with some blu-tac & listen for any change in sound.
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