Take a little Google why don’t you; type in Etymotic ER2XR and take yourself over to Reddit, if you dare. You’ll hear a lot of people bemoaning the fact that these exist. You won’t find people saying that they are bad, but just that they don’t necessarily understand where the ER2XRs fit into the Etymotic line-up. The Etymotic ER2XR utilises high-performance dynamic drivers, so let’s dive in and see if they make a difference to the sound signature.
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https://mobiletechtalk.co.uk/etymotic-er2xr-review-dynamic-bass/