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Etymotic ER4 (2015) vs Etymotic ER2XR
Etymotic ER4SR (2015)
The Etymotic ER4SR (2015) and Etymotic ER2XR make for good, if unremarkable, In-Ear Monitors at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $320 and $120 price points - it's likely that there are some better alternatives available.
If you want to learn more about the Etymotic ER4SR (2015) and the Etymotic ER2XR, however, we prepared a summary of the information that we have:
The Etymotic ER4SR (2015) was loved by reviewers at SoundGuys, a highly trusted source that performs reliable in-depth testing. It did great in its "Best earbuds of 2020" roundup where it was named its "Best Sound", which, in itself, makes it a product worth considering.
Taking a look at the Etymotic ER2XR, it got featured in roundups from two reliable sources that conduct their own testing - Head-fi and Wirecutter (NYTimes) - but it fell short of earning a top spot in either.
We examined all of the review data that we could find and first took a look at sources that reviewed both of them, like Head-fi, and found that they haven't shown a preference for either product.
Then we checked which sources liked these two In-Ear Monitors best and found that the Etymotic ER4SR (2015) got its highest, 10, review score from reviewers at Head-fi, whereas the Etymotic ER2XR earned its best score of 10 from Head-fi.
Lastly, we averaged out all of their review ratings and observed that the Etymotic ER4SR (2015), with its 8.4 average, performed considerably better than most In-Ear Monitors - the mean score for the product category being 7.7 out of 10 - while the Etymotic ER2XR managed an average of 10.0.
There's one caveat here - it might not be entirely justifiable to do a direct Etymotic ER4SR (2015) vs. Etymotic ER2XR review average comparison since they aren't priced the same and more expensive products tend to get higher review scores from some sources.