Short answer: a tie on sound quality. Both are rated 3.9/5 (#465 and #533 of 1291 in-ear headphones) at nearly the same price ($24.99 vs $22.80), so choose on features and fit.
Why pick the 7Hz x Crinacle Zero 2: Crinacle’s measurement gives it a preference score of 73, and an average deviation of just 2 dB from the Harman target is unusually even for a budget single dynamic driver. The catch: Hobbyist measurements show the presence region about 3 dB shy of target with a 4.7 dB dip near 5.9 kHz, which can make guitars and vocal consonants sound a little veiled.
What the TANGZU Wan’er S.G II does well: A very cheap single dynamic IEM, the second generation of the TANGZU Wan’er S.G. Watch for: Treble sits about 4.0 dB below target, a dark, relaxed balance.
Buy the 7Hz x Crinacle Zero 2 or the TANGZU Wan’er S.G II on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Crinacle’s measurement gives it a preference score of 73, and an average deviation of just 2 dB from the Harman target is unusually even for a budget single dynamic driver.
Amazon $24.99 AliExpress $24.99 eBay
A very cheap single dynamic IEM, the second generation of the TANGZU Wan’er S.G.
Amazon $22.80 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| 7Hz x Crinacle Zero 2 | TANGZU Wan’er S.G II | |
|---|---|---|
| Price | $24.99 | $22.80 |
| Ranked | #465 of 1291 in In-Ear Headphones | #533 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 73 (measured by crinacle, via AutoEQ) | 72 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.99 dB standard deviation | 2.07 dB standard deviation |
| Tonal Tilt | -0.71 (negative is warmer, positive brighter) | -0.41 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 19 ohms |
| Sensitivity | 108 dB SPL/V | 113.5 dB |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | - |
| Back | Closed | Closed |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the 7Hz x Crinacle Zero 2 from achoreviews, aftersound, ankramutt, atechreviews, banzai1122, bassaudio, csi-zone, dentreviews, ekaudio, gadgetrytech, iemocean, jaytiss, mmagtech, obodio, pw, regancipher, sl0the, soundignity, suporsalad, tdl and vortexreviews; the TANGZU Wan’er S.G II from lestat, pw and sl0the, all via squig.link.
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