Overview

Harmonic Empire is a sub-brand co-founded by Tangzu Audio and external investors, launched in 2025. The brand draws its identity from Chinese Three Kingdoms history — products are named after historical figures (Cai Wenji, XiaoQiao, Zhang Liao) — and targets consumers who value anime and mecha-inspired aesthetics alongside audio performance. The current lineup spans an entry-level IEM at 14 USD, a mid-range IEM at 69 USD, a flagship tribrid IEM at 179 USD, and a USB-C DAC dongle at 9.90 USD.

Scientific Validity

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No independent third-party measurements are available for any Harmonic Empire product as of the review date.

HE Cai Wenji (14 USD): Manufacturer documentation specifies only a 20Hz–20kHz frequency response range. No deviation from any target curve is provided, no THD is stated, and no S/N Ratio is disclosed. Scientific validity cannot be evaluated due to insufficient data.

HE XiaoQiao (69 USD): Manufacturer documentation states a 20Hz–20kHz frequency response range and sensitivity of 104 dB at 1kHz. No FR deviation figures, no THD, and no S/N Ratio are published. Scientific validity cannot be evaluated due to insufficient data.

HE Zhang Liao (179 USD): Manufacturer documentation states sensitivity of 112 dB at 1kHz and THD of less than 3% at 100Hz–5kHz. This THD figure is specified at rated output — indicating the level at which distortion becomes large, not performance at typical operating levels — and cannot be applied to distortion evaluation. No FR deviation and no S/N Ratio are available. Scientific validity cannot be evaluated due to insufficient data.

HE Long Zhong Dui DAC Dongle (9.90 USD): Manufacturer specifications state S/N Ratio of 105 dB, THD+N of 0.01%, and Dynamic Range of 98 dB [2]. No independent third-party verification exists for any of these figures. Conservative evaluation applies given the absence of independent verification.

Across the four products, the three IEM products provide no usable audio quality specifications, and the DAC dongle offers only unverified manufacturer claims. The overall scientific validity score reflects this near-complete absence of evaluable data.

Technology Level

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Harmonic Empire operates as a brand and marketing entity built on Tangzu Audio’s existing manufacturing infrastructure, without an independent R&D organization. No proprietary patents have been identified for any product. All technologies deployed — graphene dynamic drivers, balanced armature drivers, planar magnetic drivers, and tribrid configurations for the IEMs, plus a basic DAC chip implementation for the dongle — are standard components commoditized across the current Chinese budget-to-mid-range IEM market, in use across many competing brands since at least 2019–2022.

None of the technologies employed would be sought for licensing by competitors, who already use identical approaches. Competitive replication presents no meaningful time or investment barrier. No technical publications, white papers, or engineering documentation have been issued, and no pathway toward technical differentiation is present in the current lineup.

Cost-Performance

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This site evaluates based solely on functionality and measured performance values, without considering driver types or configurations.

Four representative products are evaluated. Weights reflect relative product importance within the lineup: Cai Wenji 0.25 (entry-level), XiaoQiao 0.35 (primary mid-range launch product), Zhang Liao 0.30 (flagship IEM), Long Zhong Dui 0.10 (peripheral accessory category).

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HE Cai Wenji — 14 USD (weight: 0.25)

User-facing functions: IEM form factor, 0.78mm 2-pin detachable cable, 3.5mm output, 20Hz–20kHz frequency coverage. No usable audio quality specifications are available for numeric comparison.

No IEM with a standard 0.78mm 2-pin detachable cable was identified below 14 USD in current market searches. The Cai Wenji is the least expensive available option in its functional category.

CP = 1.0 (no cheaper equivalent found)

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HE XiaoQiao — 69 USD (weight: 0.35)

User-facing functions: IEM form factor, 0.78mm 2-pin detachable cable, 3.5mm SE and 4.4mm balanced termination options, 20Hz–20kHz frequency coverage (manufacturer spec, no ±dB deviation stated).

The 7Hz Salnotes Zero [4] (20.99 USD, Linsoul) provides functionally equivalent performance: 0.78mm 2-pin detachable cable, 3.5mm SE output, and confirmed frequency response from 10Hz–20kHz by Crinacle third-party measurements [3]. The Salnotes Zero FR range (10Hz–20kHz, third-party confirmed) meets and extends beyond the XiaoQiao’s claimed range (20Hz–20kHz, manufacturer spec). Neither product has published numeric THD or S/N Ratio values for direct distortion or noise comparison; this comparison is provisional.

CP = 20.99 USD ÷ 69.00 USD = 0.3042 → 0.3

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HE Zhang Liao — 179 USD (weight: 0.30)

User-facing functions: IEM form factor, 0.78mm 2-pin detachable cable, 3.5mm SE and 4.4mm balanced termination options, 20Hz–20kHz frequency coverage (manufacturer spec, no ±dB deviation stated).

The same 7Hz Salnotes Zero [4] (20.99 USD) qualifies as the cheapest available option with equivalent user-facing functions and confirmed third-party frequency response measurements [3]. FR range: 10Hz–20kHz (Crinacle, third-party confirmed) vs. 20Hz–20kHz (manufacturer spec only). No usable THD or S/N Ratio figures are available for either product. Comparison is provisional.

CP = 20.99 USD ÷ 179.00 USD = 0.1172 → 0.1

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HE Long Zhong Dui — 9.90 USD (weight: 0.10)

User-facing functions: USB-C input, 3.5mm SE analog output, plug-and-play operation (no driver required), up to 192kHz/24-bit PCM support. Manufacturer-stated specifications: S/N Ratio 105 dB, THD+N 0.01%, Dynamic Range 98 dB [2].

The Jcally JA04 [5] (8.99 USD) provides all equivalent functions plus microphone passthrough, with superior manufacturer-stated performance: S/N Ratio 125 dB (vs. 105 dB), THD+N 0.003% (vs. 0.01%), Dynamic Range 100 dB or higher (vs. 98 dB), and PCM support up to 384kHz (vs. claimed 192kHz) [5]. Both comparisons rely on manufacturer specifications only; this comparison is provisional.

CP = 8.99 USD ÷ 9.90 USD = 0.9081 → 0.9

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Weighted Average:

Weighted CP = (1.0 × 0.25) + (0.3 × 0.35) + (0.1 × 0.30) + (0.9 × 0.10) = 0.250 + 0.105 + 0.030 + 0.090 = 0.475 → 0.5

All IEM comparisons are provisional due to the complete absence of third-party measurements for Harmonic Empire products.

Reliability & Support

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All Harmonic Empire products carry a 1-year manufacturer warranty covering manufacturing defects, which is below the 2-year industry average [1]. Support operates through a mixed manufacturer-direct and authorized-dealer network without a documented global manufacturer service infrastructure or dedicated repair centers. The passive IEM construction — few moving parts, no internal electronics, detachable cable standard — is inherently resistant to structural failure, partially offsetting the below-average warranty term.

Harmonic Empire launched in 2025 and has no meaningful long-term reliability track record. No statistical failure data, RMA rates, or MTBF figures are available. No long-term parts supply commitment has been disclosed.

Rationality of Design Philosophy

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Harmonic Empire’s published design rationale is framed entirely in subjective listener-preference terms with no documented measurement-based tuning methodology, no target curve alignment, and no objective performance benchmarks of any kind. A significant portion of product resources is allocated to anime-inspired aesthetics — illustrated faceplates, character artwork, branded cases, and themed naming conventions — that provide no acoustic benefit. The development approach is wholly passive and conservative: no DSP integration, no EQ app, no measurement transparency, and no published engineering justification for any acoustic design decision. Acoustic benefit claims for graphene driver materials and CNC enclosure geometry are made without supporting measurement data.

Advice

Purchasers considering the HE XiaoQiao (69 USD) or HE Zhang Liao (179 USD) should be aware that IEM alternatives from competing brands with third-party confirmed frequency response measurements are available at substantially lower prices — the 7Hz Salnotes Zero (20.99 USD) provides third-party verified FR data at a price approximately 30% of the XiaoQiao and approximately 12% of the Zhang Liao. Neither Harmonic Empire IEM has independent measurements that allow objective audio quality verification. The HE Long Zhong Dui DAC dongle (9.90 USD) is outperformed on all manufacturer-stated S/N Ratio, THD+N, and Dynamic Range figures by the Jcally JA04 (8.99 USD), which additionally includes microphone passthrough. The Cai Wenji (14 USD) occupies a more defensible position, as no cheaper IEM with a standard detachable cable connector was identified. Consumers selecting based on measured acoustic performance should prioritize products with verified third-party measurement data.

References

[1] Harmonic Empire — Official Store — https://he-online.us/collections/all — accessed 2026-05-27

[2] TANGZU — HE Longzhong 3.5mm Single-Ended Interface Adapter — https://tangzu.net/products/he-longzhong-3-5mm-single-ended-interface-adapter — accessed 2026-05-27

[3] Crinacle In-Ear Fidelity — 7Hz Salnotes Zero measurements — https://crinacle.com/graphs/iems/salnotes-zero/ — accessed 2026-05-27; FR graph data, 3 samples

[4] Linsoul — 7Hz Salnotes Zero product page — https://www.linsoul.com/products/7hz-salnotes-zero — accessed 2026-05-27

[5] HiFiGo — JCALLY JA04 Adapter ALC5686 — https://hifigo.com/products/jcally-ja04 — accessed 2026-05-27

(2026.5.28)