Overview

KZ’s ZSN Pro X is a hybrid wired IEM (1 dynamic + 1 balanced armature) with a metal/resin shell and detachable 2-pin cable. It targets entry-level buyers seeking an inexpensive, repairable earphone with a fun tilt. [1]

Scientific Validity

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Manufacturer specs: sensitivity 112 dB, impedance 25 Ω, frequency range 7–40,000 Hz. Connector is 0.75 mm 2-pin; plug is 3.5 mm. [1] Third-party testing reports that its frequency response tracks the target closely with a small bump around 5 kHz (~+5 dB), plus a slight under-emphasis between ~300 Hz and 1 kHz; distortion is low. Measured passive isolation hovers ~20–40 dB in the highs (fit-dependent). [2]

Technology Level

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A conventional 1DD+1BA hybrid and analog 3.5 mm IEM with standard 0.75 mm 2-pin interface—no DSP/ANC or novel driver tech. Solid basics, little innovation. [1]

Cost-Performance

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Review target price (denominator): 21.00 USD (Linsoul current regular price). [3]
Cheapest equivalent-or-better comparator (numerator): Moondrop CHU II — 22.99 USD (Amazon US; single DD with strong target adherence and low distortion). [5][6]

Reason for equivalence: Both are wired IEMs with detachable cables and competent measured performance; CHU II’s response adherence and low THD are equal-or-better. [6]

Because no cheaper equivalent-or-better product was confirmed at review time, CP = 1.0 (clamped). [5][6]

Reliability & Support

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Detachable cable improves repairability. Linsoul lists a 1-year IEM warranty (cable 3 months). Build and QA are typical for the price; buy from reputable sellers. [3]

Rationality of Design Philosophy

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Design prioritizes a lively, slightly bright tilt over strict neutrality. The straightforward hybrid implementation and omission of advanced features are rational for cost control, but leave measurable improvements untapped. [1][2]

Advice

• Prefer a slightly brighter treble? ZSN Pro X can be pleasing as is.
• Treble-sensitive or neutrality-seeking listeners should consider smoother options like Moondrop CHU II. [6]
• Tip rolling and deeper insertion can improve isolation and subtly reduce perceived treble. [2]

References

[1] KZ Audio — “KZ ZSN PRO X” (official page). Specs: 1DD+1BA, 0.75 mm 2-pin, 3.5 mm, 112 dB, 25 Ω, 7–40 kHz. Accessed 2025-08-27. https://kz-audio.com/kz-zsn-pro-x.html
[2] SoundGuys — “KZ ZSN Pro X review” (2024-10-29). Notes FR close to target with ~5 kHz bump (~+5 dB), slight 300 Hz–1 kHz dip; isolation ~20–40 dB at highs; low THD. Accessed 2025-08-27. https://www.soundguys.com/kz-zsn-pro-x-review-70016/
[3] Linsoul — “KZ ZSN PRO X”. Regular price 21.00 USD; warranty details. Accessed 2025-08-27. https://www.linsoul.com/products/kz-zsn-pro-x
[4] MOONDROP — “CHU II” product page. General specs/description. Accessed 2025-08-27. https://moondroplab.com/en/products/chu-ii
[5] Amazon US — “Moondrop CHU II”. Current market listing; price reference 22.99 USD (non-DSP 3.5 mm). Accessed 2025-08-27. https://www.amazon.com/Moondrop-CHU-II-Performance-Interchangeable/dp/B0CB8HHS8V
[6] SoundGuys — “Moondrop Chu II review” (2024-10-08). Reports strong target adherence and good value. Accessed 2025-08-27. https://www.soundguys.com/moondrop-chu-ii-review-104977/

(2025.8.27)