Overview

Kefine Klean is a compact single-dynamic IEM featuring a 10 mm DLC diaphragm, dual-cavity housing, detachable 0.78 mm 2-pin cable, and two interchangeable nozzles (silver/black) [1][2]. Street price sits at 49 USD via major retailers [2]. While the feature set is solid, there are aggressive alternatives around 22.99 USD (e.g., Moondrop CHU II) with abundant third-party measurements demonstrating low distortion and competent frequency response [3][4].

Scientific Validity

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Independent lab datasets specifically for Klean (standardized FR curves, THD vs. SPL, isolation, channel-matching statistics) are not found at publication. We therefore rely on manufacturer/retailer specifications: 10 mm DLC DD, 32 Ω, 107 dB sensitivity, 20 Hz–20 kHz, interchangeable nozzles, detachable 2-pin cable [1][2]. Third-party data are available for comparators (e.g., CHU II FR & distortion on ASR; GATE measurements on Headphones.com) and used contextually in CP evaluation [4][7].

Technology Level

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Conventional but competent implementation: single 10 mm DLC driver with dual-cavity acoustics, metal shells, detachable 2-pin cable, and screw-type interchangeable nozzles [1][2]. Retailer materials also mention N52 magnets and Daikoku CCAW voice coil (treated as manufacturer-origin claims) [8]. Overall, practical and modern rather than novel.

Cost-Performance

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Comparator (equal-or-better rationale): Moondrop CHU II—detachable cable and strong third-party measurements (FR/low distortion) at a much lower official price [3][4].
Prices: CHU II 22.99 USD [3]; Klean 49 USD [2].
Calculation (USD): 22.99 USD ÷ 49 USD = 0.469… → 0.5.
Result indicates significantly cheaper equivalent-or-better options exist.

Reliability & Support

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Standard coverage from major distributor: 1-year IEM warranty / 3-month cable; dealer-handled support and 30-day return for factory-sealed goods [2]. Metal shells and detachable cabling are positives, but long-term field reliability data for the brand remain limited.

Rationality of Design Philosophy

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Marketing and feature choices (DLC DD, detachable 2-pin, nozzle filters) are grounded and avoid extravagant claims. Absent extraordinary assertions, the approach aligns with measurable, user-visible benefits; however, it does not push state of the art [1][2][8].

Advice

If you want a relaxed, gently bass-emphasized tuning with stable build and simple voicing options, Klean is a reasonable pick at 49 USD [2]. For pure value and measurement-backed performance, consider CHU II (~22.99 USD) or TRUTHEAR GATE (~20 USD typical market) which have accessible third-party data and undercut Klean substantially [3][4][5][6][7]. Choose the silver nozzle for smoother treble; use the black nozzle only if you prefer more upper-mid/treble presence [2].

References

[1] Kefine — “KEFINE Klean” (official product page). https://kefineelec.com/en/ProductDetails.aspx?iProId=25 (accessed 2025-08-27).
[2] Linsoul — “KEFINE Klean” (listing: price, specs, warranty). https://www.linsoul.com/products/kefine-klean (accessed 2025-08-27).
[3] Moondrop — “All IEMs” (official pricing; CHU II 22.99 USD). https://moondroplab.com/en/iems (accessed 2025-08-27).
[4] Audio Science Review — “Moondrop CHU II IEM Review” (FR/distortion measurements). https://www.audiosciencereview.com/forum/index.php?threads/moondrop-chu-ii-iem-review.55179/ (accessed 2025-08-27).
[5] TRUTHEAR — “GATE” (official product page/specs). https://truthear.com/products/gate (accessed 2025-08-27).
[6] ShenzhenAudio — “TRUTHEAR GATE” (typical market price reference). https://shenzhenaudio.com/products/truthear-gate-dynamic-driver-in-ear-headphone (accessed 2025-08-27).
[7] Headphones.com — “Truthear GATe – New Ultra-Budget King?” (includes measurement graphs/analysis). https://headphones.com/blogs/reviews/truthear-gate-new-ultra-budget-king (accessed 2025-08-27).
[8] HiFiGo — “KEFINE Klean” (notes N52 magnet, Daikoku CCAW). https://hifigo.com/products/kefine-klean (accessed 2025-08-27).

(2025.8.28)