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Denon AH-MM400 (2016) vs AKG K52
The AKG K52 and Denon AH-MM400 (2016) make for good, if unremarkable, Closed-Back Headphones at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $60 and $350 price points - it's likely that there are some better alternatives available.
If you want to learn more about the AKG K52 and the Denon AH-MM400 (2016), however, we prepared a summary of the information that we have:
No sources that perform objective hands-on testing have deemed the AKG K52 worthy of being included in their Closed-Back Headphone roundups, which typically isn't a good sign.
Returning to the Denon AH-MM400 (2016), Wirecutter (NYTimes), a source that's known for its high-quality in-depth testing, has great things to say about it. In fact, it was named its "Top Pick" in its "The Best Everyday Audiophile Headphones" roundup, which is quite a feat.
We couldn't find any sources that tested both of these Closed-Back Headphones, so we only analyzed how they performed in reviews from different sites.
We first examined which sources rated each of these best and found that the AKG K52 got its highest, 10, rating from What Hi-Fi?, while the Denon AH-MM400 (2016) earned its best, 9.7, score from Head-fi.
Lastly, in order to better compare them to the rest of their competition, we averaged out their review scores. The Denon AH-MM400 (2016) managed to get 8.7 out of 10 - considerably better than the 7.4 review average of Closed-Back Headphones in general - whereas the AKG K52 earned 10.0 points.
It should be said that doing a direct AKG K52 vs. Denon AH-MM400 (2016) comparison might not be entirely fair due to the difference in their prices - some sources don't put much weight on value for money and thus tend to give better review scores to more expensive products.