Short answer: the KZ Castor. It ranks #297 of 450 in-ear headphones by sound quality, rated 3.9/5, at $20.89; the TANGZU Wan’er S.G ranks #328, rated 3.8/5, at $18. With prices this close, go by the sound-quality ranking rather than the cost.
Why pick the TANGZU Wan’er S.G: Crinacle’s measurement gives it a preference score of 71, and squig.link measurements show bass and midrange within about 1 dB of target from 20 Hz to 3 kHz, so voices and instruments sound natural at a very low price. The catch: Across 25 hobbyist measurements presence and treble sit about 3.5 to 4 dB below target from 3 to 10 kHz, with a 7 dB dip near 6.3 kHz, so cymbals and fine detail sound a bit softened.
Buy the KZ Castor. It is rated higher for sound quality, and saving $2.89 with the TANGZU Wan’er S.G does not make up for the sound-quality gap.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| KZ Castor | TANGZU Wan’er S.G | |
|---|---|---|
| Price | $20.89 | $18.00 |
| Ranked | #297 of 450 in In-Ear Headphones | #328 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 73 (median of 11 squig.link measurements, calibrated to AutoEQ) | 71 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.01 dB standard deviation | 2.48 dB standard deviation |
| Tonal Tilt | -0.29 (negative is warmer, positive brighter) | -0.32 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 2 x dynamic | 1 x 10mm dynamic |
| Sensitivity | 105 dB | - |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Weight | - | 0 lbs (4.2 g) per earbud |
| Built-in Microphone | - | Yes |
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More worthwhile head-to-heads for KZ Castor:
- KZ ZVX vs KZ Castor
- CCA CRA vs KZ Castor
- KZ Castor vs Tin HiFi C1
- KZ Castor vs Sony WI-C100
- KZ Castor vs KZ ZST
Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
KZ Castor: $20.89 Amazon eBay
Full KZ Castor review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.01 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 2 x dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 73 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Sensitivity | 105 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.0 dB at 30 Hz) |
| Tonal Tilt | -0.29 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
TANGZU Wan’er S.G: $18.00 Amazon AliExpress eBay
Pros: Crinacle’s measurement gives it a preference score of 71, and squig.link measurements show bass and midrange within about 1 dB of target from 20 Hz to 3 kHz, so voices and instruments sound natural at a very low price. Each earbud weighs 4.2 g, and a built-in microphone handles calls. It rates above the KZ ZST and costs less.
Cons: Across 25 hobbyist measurements presence and treble sit about 3.5 to 4 dB below target from 3 to 10 kHz, with a 7 dB dip near 6.3 kHz, so cymbals and fine detail sound a bit softened. The CCA CRA and 7Hz x Crinacle Zero 2 rate a little higher for only slightly more money.
Full TANGZU Wan’er S.G review and specifications →
| Released | 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | Yes |
| Connection | Wired |
| Deviation From Target | 2.48 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 71 (measured by crinacle, via AutoEQ) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.8 dB at 30 Hz) |
| Tonal Tilt | -0.32 (negative is warmer, positive brighter) |
| Weight | 0 lbs (4.2 g) per earbud |
EQ preset to match the Harman target
Set a preamp of -5.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.8 dB | 0.70 |
| Peak | 6,638 Hz | +5.1 dB | 1.36 |
| Peak | 145 Hz | -2.6 dB | 0.76 |
| Peak | 1,930 Hz | -2.9 dB | 1.79 |
| Peak | 9,431 Hz | +3.0 dB | 2.56 |
| High shelf | 10,000 Hz | -1.1 dB | 0.70 |
| Peak | 894 Hz | +1.2 dB | 1.34 |
| Peak | 1,321 Hz | -1.2 dB | 2.81 |
| Peak | 275 Hz | -0.4 dB | 1.71 |
| Peak | 570 Hz | +0.5 dB | 2.18 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons