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Sennheiser HD558 vs HifiMan HE-400s (2015)
HifiMan HE-400s (2015)
The Sennheiser HD558 and the HifiMan HE-400s (2015) are merely passable for their respective price points and don't stand out from their competition in any meaningful way. We recommend that you take a look at some other Open-Back Headphones that cost around $230.
However, if you're still interested in learning more about these two options, we wrote a short summary of what we know 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, TrustedReviews, Head-fi, and What Hi-Fi? all gave it a spot on their list.
As for the HifiMan HE-400s (2015), it wasn't able to earn a top spot in any roundups from trusted sources that conduct their own hands-on testing. Nevertheless, it managed to impress reviewers at Head-fi, Headphone Review, Headfonics, and Audioholics enough to make it onto their respective shortlists.
As for a direct Sennheiser HD558 vs. HifiMan HE-400s (2015) comparison of their review performance, we examined sources that tested and rated both products, like Head-fi. It turns out that all such sources consider the HifiMan HE-400s (2015) to be the superior product.
We also looked at the available data to find which sources liked each of them best and learned that the Sennheiser HD558 most impressed reviewers at Expert Reviews - they gave it a score of 10, whereas the HifiMan HE-400s (2015) got rated best by Head-fi - 8.9.
Finally, we also compared their review scores to the rest of their competition - the Sennheiser HD558 earned an average review score of 8.9 out of 10 points and the HifiMan HE-400s (2015) received an average of 8.3, compared to the 7.8 average of Open-Back Headphones in general.