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- #161
Yes. In original use for on stage monitoring the seal is essential to get enough isolation to hear only what you want to monitor and exclude the rest of the noise. Also why some musicians remove one ear to get both I think.So by that definition, IEM = device that makes a seal with the ear.
Anything that just sits there not inserted into the canal and blocking it with a soft material to seal (or a custom fit tube) isnt an IEM. Probably best defined as an (ear) bud