Overview

The Tanchjim Bunny is a ~20 USD single dynamic IEM positioned in the ultra-budget segment. It uses a dual-chamber acoustic design with a titanium-plated PET diaphragm and ships in either a 3.5 mm analog version or a USB-C DSP bundle; both use a detachable 0.78 mm 2-pin interface [2][3]. Tanchjim’s companion software provides firmware and DSP support for applicable products [5].

Scientific Validity

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Manufacturer specifications list THD at 0.05% @ 1 kHz, 94 dB, frequency response 8 Hz–48 kHz, nominal impedance 30 Ω (±10%), and sensitivity 123 dB/Vrms [2][3][9]. If verified, the THD figure meets the “excellent” threshold for earphones in our criteria. However, as of the review date we have not found credible third-party measurements for Bunny’s full response and distortion; therefore the score remains baseline (0.5) pending independent confirmation. The 2-pin architecture and conventional single-DD topology are standard and do not, by themselves, guarantee transparent frequency response [8].

Technology Level

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The Bunny implements mature, widely-adopted approaches: single DD with dual-chamber loading, titanium-plated PET diaphragm, and (for the DSP bundle) dual 24-bit DACs with up to 96 kHz support via USB-C cable [2][4]. Nothing here represents a step-change other manufacturers would need to adopt; execution appears competent rather than novel.

Cost-Performance

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Using the defined formula, we select the cheapest equivalent-or-better product by functions and measured performance proxies:

• Comparator: TANGZU Wan’er S.G, 18.90 USD (detachable 0.78 mm 2-pin; community FR measurements show neutral-leaning tuning comparable to established baselines) [6][7].
• Equivalence note: Same user-visible functions (wired IEM, detachable 2-pin) and community FR behavior aligned to neutral targets, so user-facing performance is equivalent-or-better on FR; no known deficits in basic specs.

CP = 18.90 USD ÷ 20 USD = 0.945 → 0.9 (rounded to one decimal).
For context, MOONDROP CHU II commonly lists at 22.99 USD [10], which would yield a higher CP (clamped to 1.0), but Wan’er S.G is cheaper while meeting equivalence.

Reliability & Support

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Budget construction with a detachable 2-pin cable aids field serviceability for common failures [2][8][9]. Warranty norms seen at retailers show about 1 year on the earpieces (shorter on cables) depending on region/retailer; manufacturer app/firmware support is relevant only to DSP-cable use [4][5].

Rationality of Design Philosophy

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The design prioritizes conventional, cost-effective engineering (single DD, dual-chamber, detachable 2-pin) and optional DSP/EQ via cable/app to meet user preferences [2][4][5]. The approach is practical and avoids unsupported claims; it neither advances the state of the art nor exhibits pseudoscientific elements.

Advice

If you want a detachable-cable IEM around 20 USD and can accept “competent but unverified” third-party measurements for this exact model, Bunny is reasonable. If you want the maximum verified performance per dollar and can deviate from Tanchjim, consider TANGZU Wan’er S.G (cheaper, neutral-leaning FR per community databases) or MOONDROP CHU II (widely measured, slightly higher street price) [6][7][10]. Choose the DSP bundle only if you specifically need app-tunable EQ via USB-C [4][5].

References

1. Tanchjim — Bunny product page. Accessed Aug 31, 2025. https://www.tanchjimaudio.com/product/bunny
2. Audiophonics — TANCHJIM BUNNY Type-C spec page (THD 0.05%, 30 Ω, 123 dB/Vrms, 0.78 mm 2-pin, DAC 24-bit/96 kHz). Accessed Aug 31, 2025. https://www.audiophonics.fr/en/in-ear-earphones/tanchjim-bunny-type-c-p-20419.html
3. Audiophonics — TANCHJIM BUNNY 3.5 mm spec page. Accessed Aug 31, 2025. https://www.audiophonics.fr/en/in-ear-earphones/tanchjim-bunny-3-5-p-20418.html
4. The Audio Store (IN) — TANCHJIM BUNNY Type-C DSP Plug with Mic IEM (specs incl. 24-bit/96 kHz DSP, 0.78 mm 2-pin; regional warranty example). Accessed Aug 31, 2025. https://www.theaudiostore.in/products/tanchjim-bunny-type-c-dsp-plug-with-mic-iem
5. Tanchjim — APP Services / DSP & firmware utilities. Accessed Aug 31, 2025. https://www.tanchjimaudio.com/app-services
6. Linsoul — TANGZU Wan’er S.G price (18.90 USD). Accessed Aug 31, 2025. https://www.linsoul.com/products/tangzu-waner-s-g
7. Squiglink (community FR database) — datasets incl. TANGZU Wan’er S.G. Accessed Aug 31, 2025. https://tanchjim.squig.link/
8. Head-Fi — TANCHJIM Bunny page (detachable 0.78 mm two-pin, product overview). Accessed Aug 31, 2025. https://www.head-fi.org/showcase/tanchjim-bunny.27743/
9. Amazon — TANCHJIM Bunny listing (spec block referencing 30 Ω, 123 dB/Vrms, FR 8–48 kHz, 0.78 mm 2-pin). Accessed Aug 31, 2025. https://www.amazon.com/HiFiGo-Tanchjim-Bunny-Magnetic-Enthusiasts/dp/B0DNK3JPTG
10. MOONDROP Official — Products list showing CHU II at 22.99 USD. Accessed Aug 31, 2025. https://moondroplab.com/en/products

(2025.8.31)