When the Etymotic ER4 was originally released, way back in the 90s, it was one of the first IEMs in existence. Sporting a utilitarian “deep insertion” design and a single balanced-armature driver, it may seem less technically advanced than today’s fancy multi-BA or hybrid IEMs. But make no mistake: the $300 Etymotic ER4SR, the latest update of the ER4 along with the ER4XR, is still one of the best-sounding IEMs on the market, especially in the under-$500 (or even under-$1,000) price bracket.
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https://majorhifi.com/etymotic-er2se-and-er4sr-a-comparison/