Overview

AFUL Performer5 is a 5-driver hybrid in-ear monitor (1DD+4BA) launched in late 2022. It combines AFUL’s RLC Network Frequency Division, a high-precision 3D-printed acoustic tube structure, and a high-damping air-pressure balance system to pursue a smooth, balanced presentation around the 220 USD price point [1].

Scientific Validity

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Manufacturer specs list 35 Ω impedance, 110 dB@1 kHz sensitivity, a 5 Hz–35 kHz rated bandwidth, and ~26 dB passive isolation [1]. Independent IEC-711–based measurements show a generally smooth frequency response with modest deviations from strict neutrality and the usual uncertainty above ~8 kHz inherent to coupler measurements [2]. Some third-party commentary notes non-trivial distortion behavior in parts of the midrange, but robust, comparable THD datasets remain limited [3]. Taken together—solid isolation, sensible FR, and sparse THD evidence—the overall measured performance lands at a moderate level for this class.

Technology Level

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The design employs in-house RLC frequency-division and correction, plus a high-precision 3D-printed multi-tube system (including an ultra-long bass tube and mid-bass duct) aimed at phase/response control. The air-pressure balance scheme targets comfort while preserving bass texture. These mechanisms go beyond typical passive crossovers and generic bores seen at this price [1].

Cost-Performance

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Comparator (cheapest equal-or-better option): 7Hz x Crinacle Zero:2 — detachable 0.78 mm 2-pin wired IEM with neutral-adjacent tuning and IEC-711 FR traces aligning closely to a modern reference target; user-visible functions match, and measured tonality is not inferior [4][5].
Prices (current market): Performer5 219.99 USD (official store) [1]; Zero:2 24.99 USD (official retailer) [4].
Calculation: 24.99 USD ÷ 219.99 USD = 0.1136 → 0.1 (rounded to the first decimal place).
Performer5 may justify a premium for build/fit and its proprietary acoustic engineering, but strictly by “what percent of the price buys equivalent user-relevant performance,” Zero:2 is the lowest-cost qualifying alternative.

Reliability & Support

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No widespread reliability defects are documented. AFUL lists the Performer5 on its official store and routes practical support through sellers; typical warranty terms for IEMs are 1 year at major retailers [1]. Build quality (resin shells, 0.78 mm 2-pin) appears competent; long-term failure-rate data remain limited given product age.

Rationality of Design Philosophy

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AFUL’s approach—electrical correction (RLC), controlled acoustic path lengths via 3D-printed tubes, and pressure management—directly targets common hybrid pitfalls (phase integration, nozzle resonances, comfort). The emphasis on a smooth, peak-controlled response is consistent with evidence-based tuning priorities [1][2].

Advice

Performer5 suits listeners prioritizing a cohesive, fatigue-free tonality with strong isolation and who value AFUL’s engineering approach. If your goal is maximum performance-per-dollar with equivalent user-facing functions and neutral-adjacent FR, 7Hz x Crinacle Zero:2 is the cheapest proven alternative and drives the CP score.

References

[1] AFUL Audio — “AFUL Performer 5 IEMs (specs, price, tech).” https://afulaudio.com/products/aful-performer-5-iems (accessed 2025-08-15)
[2] Headphones.com (Precogvision) — “Aful Performer 5 Review” (IEC-711 FR notes). https://headphones.com/blogs/reviews/aful-performer-5-review (accessed 2025-08-15)
[3] audio-sound (@ ear-phone-review) — “AFUL Performer 5: Good neutral sound balance.” https://blog.ear-phone-review.com/entry/AFUL_Performer_5 (accessed 2025-08-15)
[4] Linsoul — “7Hz x Crinacle Zero:2” (price and specs incl. 0.78 mm 2-pin). https://www.linsoul.com/products/7hz-x-crinacle-zero-2 (accessed 2025-08-15)
[5] Super* Review Squiglink — “7Hz Zero:2 (IEC-711 FR share).” https://pw.squig.link/index.html?share=7Hz_Salnotes_Zero_2 (accessed 2025-08-15)

(2025.8.15)