7Hz Crinacle Zero:2
An ultra-budget IEM co-developed by 7Hz and Crinacle. It lightly boosts bass over the original Zero’s neutral tuning and uses a single 10 mm dynamic driver. Third-party measurements show low distortion and well-behaved frequency response. With practical features like 0.78 mm 2-pin connectors, it delivers solid performance around 25 USD.
Overview
The 7Hz × Crinacle Zero:2 is a single-dynamic IEM tuned for a slightly warmer balance than the original Zero. It includes a detachable 0.78 mm 2-pin cable. Typical US street price is about 25 USD[1][3]. Public measurement databases indicate a neutral-leaning response with modest bass lift consistent with the design intent[2].
Scientific Validity
\[\Large \text{0.8}\]Independent lab measurements show very low distortion: mid/high bands generally below about 0.1% and bass remaining under roughly 0.5%, with a smooth THD curve across the band[1]. Frequency response tracks a neutral target with added bass and without notable narrow-band anomalies[2].
Technology Level
\[\Large \text{0.7}\]This is a straightforward single-DD design without novel multi-way topologies or proprietary processing. Still, the measurement-guided tuning and practical 2-pin implementation are sensible at the price[3]. In terms of originality, it’s competent rather than groundbreaking.
Cost-Performance
\[\Large \text{0.8}\]Denominator: Zero:2 current US street price ≈ 25 USD[1][3].
Comparator (Numerator): Moondrop CHU II, a detachable-cable single-DD IEM with comparable measurement performance (low THD and neutral-aligned FR) at 19 USD[4][5].
Computation: 19 ÷ 25 ≈ 0.76 → rounded to 0.8.
This keeps EN/JA CP scores aligned using the same USD basis.
Reliability & Support
\[\Large \text{0.7}\]A lightweight shell and detachable cable aid maintainability. Long-term durability data remain limited at this price tier. Warranty and support terms follow the retailer’s policy; see the seller’s page for specifics[3]. Accessories and replacement parts are easy to source.
Rationality of Design Philosophy
\[\Large \text{0.8}\]Prioritizing low distortion and a target-consistent FR at a minimal price is a rational approach supported by third-party data[1][2]. Since this refines established methods rather than introducing new technology, we cap the score at 0.8.
Advice
If you want a neutral-tilted wired IEM with a touch more bass, low measured distortion, and a detachable 2-pin cable around 25 USD, Zero:2 is a strong, low-risk pick[1][2]. If you’re strictly minimizing spend while keeping similar objective performance and features, Moondrop CHU II is a credible cheaper alternative to shortlist[4][5]. Final choice should consider fit/seal and your usage environment.
References
[1] Audio Science Review, “7Hz x Crinacle Zero:2 IEM Review”, https://www.audiosciencereview.com/forum/index.php?threads/7hz-x-crinacle-zero-2-iem-review.50534/ , Published: 2023-12-18 / Accessed: 2025-08-20 (measurements, price)
[2] Hangout.Audio (Crinacle 5128 DB), “Zero2_S1 and peers FR (5128)”, https://graph.hangout.audio/iem/5128/?share=Zero_Salnotes%2CChu%2CWan%27er%2CChu_2%2CGate%2CHola%2CZero2_S1 , Accessed: 2025-08-20 (frequency response context)
[3] Linsoul, “7HZ x Crinacle Zero:2”, https://www.linsoul.com/products/7hz-x-crinacle-zero-2 , Accessed: 2025-08-20 (features, pricing)
[4] Audio Science Review, “Moondrop Chu II IEM Review”, https://www.audiosciencereview.com/forum/index.php?threads/moondrop-chu-ii-iem-review.55179/ , Published: 2024-06-16 / Accessed: 2025-08-20 (measurements, price)
[5] Audio Science Review, “Headphone Measurements List (price table)”, https://www.audiosciencereview.com/asrdata/HeadphoneallList?pageno=1&recperpage=ALL , Accessed: 2025-08-20 (Zero:2 at 24.99 USD, Chu II at 19.00 USD)
(2025.8.21)