Short answer: a tie on sound quality. Both are rated 3.8/5 (#576 and #604 of 1291 in-ear headphones) at nearly the same price ($259 vs $259), so choose on features and fit.
What the Kiwi Ears Halcyon does well: The median of 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 2.07 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 3.4 dB low with a 6.5 dB dip near 6.1 kHz, so vocals and instruments lose some bite.
The case for the TANGZU Zetian Wu Legend: A dual planar IEM with a 14.2mm bass planar and a 6mm treble planar. The catch: Treble sits about 2.5 dB below target, a dark, relaxed balance.
Buy the Kiwi Ears Halcyon or the TANGZU Zetian Wu Legend on features: they are rated the same for sound quality at close to the same price.
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The median of 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 2.07 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $259.00 eBay
A dual planar IEM with a 14.2mm bass planar and a 6mm treble planar.
Amazon $259.00 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
| Kiwi Ears Halcyon | TANGZU Zetian Wu Legend | |
|---|---|---|
| Price | $259.00 | $259.00 |
| Ranked | #576 of 1291 in In-Ear Headphones | #604 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Tribrid | Planar Magnetic |
| Drivers | 1 x 10mm dynamic + 3 x balanced armature + 1 x MEMS | 1 x 14.2mm planar + 1 x 6mm planar |
| Impedance | 29 ohms | 12.5 ohms |
| Sensitivity | 109 dB/mW | - |
| Frequency Response | 10Hz - 42kHz (Manufacturer specified) | - |
| Harman Preference Score | 71 (median of 16 squig.link measurements, calibrated to AutoEQ) | 71 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.07 dB standard deviation | 2.19 dB standard deviation |
| Tonal Tilt | -0.70 (negative is warmer, positive brighter) | -0.38 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.0 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 Kiwi Ears Halcyon from aden, aftersound, atechreviews, audioamigo, avishai, bassaudio, dchpgall, dl, ducbloke, elrics, flare, hobbytalk, lumerion, silicagel, soundcheck39 and tonedeafmonk; the TANGZU Zetian Wu Legend from audioamigo, csi-zone, jaytiss and soundignity, all via squig.link.
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