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Denon AH-MM400 (2016) vs beyerdynamic T51
The Denon AH-MM400 (2016) makes for a good, if unremarkable, On-Ear Headphone for people with a $340 budget.
The beyerdynamic T51i, however, is merely mediocre at its $199 asking price, when compared to similarly priced products, and won't satisfy the needs of most people.
In either case, we suggest that you first take a look at some other options at the $340 and $240 price points before committing to one of these - it's likely that you'll be able to find some better alternatives.
If you're still interested in learning more about the Denon AH-MM400 (2016) and beyerdynamic T51i, however, we wrote a summary of what we could find 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.
Taking a look at the beyerdynamic T51i, it got featured in roundups from two reliable sources that conduct their own testing - Headphone Review and Head-fi - but it fell short of earning a top spot in either.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both On-Ear Headphones, including Head-fi, preferred the Denon AH-MM400 (2016) over the beyerdynamic T51i.
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 beyerdynamic T51i got its highest, 8.8, score from Headphone Review.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other On-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 On-Ear Headphones being 7.4 out of 10, whereas the Denon AH-MM400 (2016) and beyerdynamic T51i managed averages of 8.7 and 8.7 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Denon AH-MM400 (2016) vs. beyerdynamic T51i 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.