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KZ ZS3 vs RHA S500 (2017)
The KZ ZS3 and RHA S500 (2017) make for good, if unremarkable, Canal Earphones at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $10 and $30 price points - it's likely that there are some better alternatives available.
If you want to learn more about the KZ ZS3 and the RHA S500 (2017), however, we prepared a summary of the information that we have:
The reviewers at Head-fi have featured the KZ ZS3 in their KZ-ZS3 Hifi High-End 3.5mm In-Ear Earphone Headphones Earpiece Original Headset Bass Earbuds With Microphone review roundup. However, it fell short of making it to the top of their list.
Moving on to the RHA S500 (2017): it was unable to reach the very top of any roundups from sources that conduct reliable and unbiased testing. Nonetheless, it still managed to impress reviewers from a number of such sites, like Techradar, PCmag, SoundGuys, Tech Advisor, Expert Reviews, Head-fi, TrustedReviews, and What Hi-Fi?, enough for them to include them on those lists.
When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Canal Earphones, including Head-fi, preferred the KZ ZS3 over the RHA S500 (2017).
We also took a look at which sources they managed to impress the most. The KZ ZS3 was liked best by Head-fi, which gave it a score of 9, while the RHA S500 (2017) got its highest, 9, score from Techradar.
Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Canal Earphones on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Canal Earphones being 7.4 out of 10, whereas the KZ ZS3 and RHA S500 (2017) managed averages of 9.0 and 7.6 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct KZ ZS3 vs. RHA S500 (2017) 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.