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Sennheiser RS 175 RF (2015) vs Denon AH-MM400 (2016)
Sennheiser RS 175 RF ( RS 175)
The Sennheiser RS 175 RF ( RS 175) 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 $250 and $400 price points - it's likely that there are some better alternatives available.
If you want to learn more about the Sennheiser RS 175 RF ( RS 175) and the Denon AH-MM400 (2016), however, we prepared a summary of the information that we have:
The Sennheiser RS 175 RF ( RS 175) was loved by reviewers at Rtings, a highly trusted source that performs reliable in-depth testing. It did great in its "The 5 Best TV Headphones - Fall 2020" roundup where it was named its "Best Dedicated TV Headphones", which, in itself, makes it a product worth considering.
As for the Denon AH-MM400 (2016) - it was really well-received by reviewers at Wirecutter (NYTimes), a great source that's known for conducting high-quality in-depth testing. It performed great in its "The Best Everyday Audiophile Headphones" roundup and was named its "Top Pick", which, on its own, makes it a product that warrants a closer look.
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 Sennheiser RS 175 RF ( RS 175) got its highest, 9, rating from HomeTheaterReview.com, while the Denon AH-MM400 (2016) earned its best, 9.7, score from Head-fi.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Closed-Back Headphones on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Closed-Back Headphones being 7.4 out of 10, whereas the Sennheiser RS 175 RF ( RS 175) and Denon AH-MM400 (2016) managed averages of 7.8 and 8.7 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct Sennheiser RS 175 RF ( RS 175) 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.