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Sony WH-1000XM4 (2020) vs HifiMan HE-400s (2015)
HifiMan HE-400s (2015)

The Sony WH-1000XM4 managed to impress reviewers from many of the internet's most highly trusted sources, including TechGearLab, Tom's Guide, Laptop Mag, CNET, Rtings, and Wirecutter. It performed really well in their Open-Back Headphone roundups - it was named "Top Pick" by TechGearLab, "Still a popular choice and a great value buy" by Tom's Guide, and "Champion sound paired with excellent ANC" by Laptop Mag. That's high praise coming from sources that conduct in-depth hands-on testing.
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, and Headfonics enough to make it onto their respective shortlists.
We also performed a thorough Sony WH-1000XM4 vs. HifiMan HE-400s (2015) review score analysis - it turns out that all of the sources that have tested both Open-Back Headphones, including Headphone Review, preferred the Sony WH-1000XM4 over the HifiMan HE-400s (2015).
Out of all the sources that reviewed them, the Sony WH-1000XM4 turned out to be most loved by musicphotolife.com, which gave it a score of 10, whereas the HifiMan HE-400s (2015) got its highest, 8.8, rating from reviewers at Head-fi.
Finally, we also compared their review scores to the rest of their competition - the Sony WH-1000XM4 earned an average review score of 9.0 out of 10 points and the HifiMan HE-400s (2015) received an average of 8.4, compared to the 7.8 average of Open-Back Headphones in general.
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