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Edifier H840 (2013) vs Bluedio T4 (2017)
We couldn't find enough data on either product to be able to come to any reliable conclusions. We highly recommend that you take a look at some other options instead.
The Edifier H840 (2013) hasn't managed to get enough recognition from sources that do high-quality hands-on testing and therefore didn't make it into any relevant roundups. That, by itself, makes it difficult to recommend.
Taking a look at the Bluedio T4 (2017), we found that it hasn't managed to perform well enough to earn a spot in any Noise-Cancelling Headphone roundups done by sources that conduct their own, high-quality, hands-on testing. That alone makes it difficult to recommend.
As a last step, we wanted to do a head-to-head Edifier H840 (2013) vs. Bluedio T4 (2017) comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.