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@swift_comet_37 · Owner-reported
Owned 1–6 months · Still using it: no, stopped · Posted
In terms of sound characteristics, the soundstage is quite narrow, making everything feel close. While I can recommend them for their excellent value, that does not necessarily mean the sound quality itself is "good."
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And what's a Knowledge Zenith anyway?
Would buy it again; has stopped using it.
Owned 1–6 months.
Metal is the most common — on 16% of the 49 in-ear monitors we've cataloged (of 38).
Wired-3.5mm is the most common — on 95% of the 37 in-ear monitors we've cataloged (of 38).
Silicone is the most common — on 65% of the 51 in-ear monitors we've cataloged (of 38).
True appears on 32% of the 34 in-ear monitors we've cataloged (of 38).
Objective measurements from the SoundGuys test lab — overlay other models to see how this one compares.
KZ ZSN Pro X Frequency Response (measured on a B&K 5128)
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Measured frequency response (dB relative) against the SoundGuys Headphone Preference Curve. When the measurement goes above the dashed line, that frequency is louder than our preference curve, and when it goes below: it's quieter. Use the curve for comparison purposes only, as your taste may vary.
| Frequency (Hz) | Response (dB) |
|---|---|
| 20 | 3.9 |
| 25 | 4.1 |
| 32 | 4.1 |
| 40 | 4.0 |
| 50 | 3.7 |
| 63 | 3.3 |
| 80 | 2.6 |
| 100 | 1.8 |
| 125 | 0.7 |
| 160 | -1.0 |
| 200 | -0.4 |
| 250 | -1.0 |
| 315 | -2.4 |
| 400 | -3.8 |
| 500 | -4.9 |
| 630 | -3.7 |
| 800 | -3.0 |
| 1000 | -1.7 |
| 1250 | 0.4 |
| 1600 | 4.3 |
| 2000 | 7.4 |
| 2500 | 8.2 |
| 3150 | 6.1 |
| 4000 | 6.6 |
| 5000 | 10.1 |
| 6300 | 4.4 |
| 8000 | 6.3 |
| 10000 | 4.8 |
| 12500 | -1.2 |
| 16000 | -2.3 |
| 20000 | -24.3 |
KZ ZSN Pro X Attenuation (measured on a B&K 5128)
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Solid lines: passive isolation (dB) with ANC off — how much ambient noise the fit blocks on its own. Higher on the chart means more attenuation.
| Frequency (Hz) | Attenuation (dB) |
|---|---|
| 21 | 4.0 |
| 26 | 3.5 |
| 33 | 2.4 |
| 41 | 2.7 |
| 52 | 3.0 |
| 65 | 3.6 |
| 82 | 4.0 |
| 103 | 6.0 |
| 130 | 2.5 |
| 163 | 2.3 |
| 205 | 7.0 |
| 259 | 9.0 |
| 325 | 9.6 |
| 410 | 9.0 |
| 516 | 9.4 |
| 613 | 9.3 |
| 772 | 12.7 |
| 972 | 12.7 |
| 1220 | 14.1 |
| 1540 | 19.6 |
| 1940 | 25.3 |
| 2440 | 25.1 |
| 3070 | 25.5 |
| 3870 | 19.1 |
| 4870 | 21.5 |
| 6130 | 28.3 |
| 7720 | 19.2 |
| 9720 | 34.6 |
| 12200 | 24.2 |
| 15400 | 29.6 |
| 19400 | 38.2 |
The verdict
The KZ ZSN PRO X offers superb sound for very little money, like under $30 USD. It has some rough edges with a plastic seam on the cable that can rub on your ear, and the bud is a bit large. The tech isn't cutting edge, but new doesn't always equal better. You should try it.
✓Liked: Good sound, Fantastic value, Replaceable two-pin cable
✕Could be better: Buds won't fit small ears, Controls don't reliably work
What a reader who owns the KZ ZSN Pro X reports after living with it. Owner-reported, checked before publishing; ordered photo-verified first, then newest.
Owner reviews are not paid for, not solicited from specific owners, and not rewritten by us: at most we proofread typos, which is shown on the review’s own page and which the author can undo. The commission SoundGuys may earn on this page comes from retail links, never from owner reviews.
1 owner review
SCEvery author writes under a generated pseudonym; a member can choose to show their name and photo beside it. A signed-in author’s email is never shown. Read more · The reader says they own it. We have not seen proof, and we say so — no label here is proof of a purchase. Read more · Owned 1–6 months · Still using it: no, stopped · Posted
Would buy againIn terms of sound characteristics, the soundstage is quite narrow, making everything feel close. While I can recommend them for their excellent value, that does not necessarily mean the sound quality itself is "good."
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0 of 1 would buy again
1 owner
Expected more from the cable
