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KZ ZS3 vs Shure SE425 (2010)
The KZ ZS3 makes for a good, if unremarkable, Canal Earphone for people with a $10 budget.
The Shure SE425 (2010), however, is merely mediocre at its $259 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 $10 and $230 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 KZ ZS3 and Shure SE425 (2010), however, we wrote a summary of what we could find about them:
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.
As for the Shure SE425 (2010) - it impressed reviewers at What Hi-Fi?, a trustworthy source that conducts solid hands-on testing. It did great in its "Best headphones 2020" roundup - in fact, it earned its "An excellent pair of no-compromise in-ear headphones." title, which, on its own, indicates a certain level of quality.
We couldn't find any sources that tested both of these Canal Earphones, 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 KZ ZS3 got its highest, 9, rating from Head-fi, while the Shure SE425 (2010) earned its best, 10, score from What Hi-Fi?.
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 Shure SE425 (2010) managed averages of 9.0 and 8.2 points, respectively.
Due to the difference in their prices, however, it's important to keep in mind that a direct KZ ZS3 vs. Shure SE425 (2010) 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.