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Sony WF-SP700N vs KZ ZS3
The KZ ZS3 makes for a good, if unremarkable, Canal Earphone for people with a $9 budget.
The Sony WF-SP700N, however, is merely mediocre at its $89 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 $9 and $90 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 Sony WF-SP700N, 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.
Moving on to the Sony WF-SP700N: 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 Head-fi, Rtings, CNET, SoundGuys, The Verge, Techradar, PCmag, and Tom's Guide, 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 Sony WF-SP700N.
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 Sony WF-SP700N got its highest, 8, score from Head-fi.
Lastly, in order to better compare them to their competition, we averaged out their review scores and found that the KZ ZS3 got received considerably better than the majority of other Canal Earphones - it earned an average of 9.0 out of 10 points, compared to the 7.4 overall rating of other Canal Earphones - while the Sony WF-SP700N performed worse than most of its competitors, with its average review score of 6.4.
It's worth keeping in mind, however, that a direct KZ ZS3 vs. Sony WF-SP700N comparison might not be realistic since they're priced differently and some sources have a tendency to review more expensive products better than cheaper ones.