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Sennheiser HD558 vs Edifier H840 (2013)
The Sennheiser HD558 and the Edifier H840 (2013) are decent Over-Ear Headphones at their respective price points, but don't manage to stand out from their direct competitors in any meaningful way. We suggest that you also look at some alternatives that can be found for around $280 or $45.
If you're still interested in learning a bit more about the Sennheiser HD558 and the Edifier H840 (2013), however, read on for a summary of what we could gather about them:
The Sennheiser HD558 hasn't managed to earn a top spot in any roundups from sources that conduct trustworthy hands-on testing. Nevertheless, reviewers from sites, such as Expert Reviews, Head-fi, and What Hi-Fi? all gave it a spot on their list.
As for the Edifier H840 (2013) - it impressed reviewers at Reviewed, a trustworthy source that conducts solid hands-on testing. It did great in its "Best Headphones Under $50 of 2021" roundup - in fact, it earned its "Top Pick" title, which, on its own, indicates a certain level of quality.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Over-Ear Headphones, including Head-fi, preferred the Sennheiser HD558 over the Edifier H840 (2013).
We also took a look at which sources they managed to impress the most. The Sennheiser HD558 was liked best by Expert Reviews, which gave it a score of 10, while the Edifier H840 (2013) got its highest, 8, score from Head-fi.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Over-Ear Headphones on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Over-Ear Headphones being 7.5 out of 10, whereas the Sennheiser HD558 and Edifier H840 (2013) managed averages of 8.9 and 8.0 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Sennheiser HD558 vs. Edifier H840 (2013) comparison might not be entirely fair - some sources don't take value for money into account when assigning their scores and therefore have a tendency to rate more premium products better.

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