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Sony MDR-1A (2014) vs Denon AH-MM400 (2016)
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 Sony MDR-1A (2014) 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 PCmag, What Hi-Fi?, TrustedReviews, and Rtings all gave it a spot on their list.
As for the Denon AH-MM400 (2016), 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, Techradar, TrustedReviews, and TechSpot enough to make it onto their respective shortlists.
We conducted an analysis of all of the review data that we could find on these two products. First, we focused on sources that tested and rated both of them, like TrustedReviews, and learned that they all showed a preference for the Denon AH-MM400 (2016).
Then we took a look at the highest review scores that these two Over-Ear Headphones received. We found that the Sony MDR-1A (2014) managed to earn a rating of 9 from PCmag, whereas the Denon AH-MM400 (2016) got its highest, 9.7, score from reviewers at Head-fi.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Over-Ear Headphones on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Over-Ear Headphones being 7.5 out of 10, whereas the Sony MDR-1A (2014) and Denon AH-MM400 (2016) managed averages of 8.3 and 9.1 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Sony MDR-1A (2014) vs. Denon AH-MM400 (2016) comparison might not be entirely fair - some sources don't take value for money into account when assigning their scores and therefore have a tendency to rate more premium products better.