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Denon AH-MM400 (2016) vs Koss UR20
The Denon AH-MM400 (2016) is a relatively good Closed-Back Headphone for people that are willing to spend around $340. The Koss UR20, by contrast, is quite unremarkable and doesn't stand out in any meaningful way from other products at this price point.
If you're still interested in learning more about the Denon AH-MM400 (2016) and Koss UR20, however, we wrote a summary of what we know about them:
The Denon AH-MM400 (2016) was loved by reviewers at Wirecutter (NYTimes), a highly trusted source that performs reliable in-depth testing. It did great in its "The Best Everyday Audiophile Headphones" roundup where it was named its "Top Pick", which, in itself, makes it a product worth considering.
As for the Koss UR20 - it was really well-received by reviewers at Rtings, a great source that's known for conducting high-quality in-depth testing. It performed great in its "The 5 Best Earbuds And Headphones Under $20 - Fall 2020" roundup and was named its "Best Over-Ear Headphones Under $20", which, on its own, makes it a product that warrants a closer look.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Closed-Back Headphones, including Head-fi, preferred the Denon AH-MM400 (2016) over the Koss UR20.
We also took a look at which sources they managed to impress the most. The Denon AH-MM400 (2016) was liked best by Head-fi, which gave it a score of 9.7, while the Koss UR20 got its highest, 5.3, score from Rtings.
Lastly, in order to better compare them to their competition, we averaged out their review scores and found that the Denon AH-MM400 (2016) got received considerably better than the majority of other Closed-Back Headphones - it earned an average of 8.7 out of 10 points, compared to the 7.4 overall rating of other Closed-Back Headphones - while the Koss UR20 performed worse than most of its competitors, with its average review score of 4.7.
It's worth keeping in mind, however, that a direct Denon AH-MM400 (2016) vs. Koss UR20 comparison might not be realistic since they're priced differently and some sources have a tendency to review more expensive products better than cheaper ones.