Short answer: the Kinera Celest Yaksha. Both are rated 3.6/5 for sound quality (#727 and #707 of 1291 in-ear headphones), and the Kinera Celest Yaksha costs $139 against $152.10 for the Letshuoer S12 Ultra, so with nothing between them on sound quality, price settles it.
The case for the Kinera Celest Yaksha: A four driver hybrid with two dynamic drivers, a Knowles balanced armature and a micro planar. The catch: Treble sits about 3.0 dB below target, a dark, relaxed balance.
The case for the Letshuoer S12 Ultra: The median of 12 hobbyist measurements gives it a solid Harman preference score of 69 with a 2.18 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The tradeoff: Presence sits about 4 dB low with a 6 dB dip near 3.4 kHz, so vocals and instruments lose some bite.
Buy the Kinera Celest Yaksha. Both are rated the same for sound quality, and it costs $13.10 less than the Letshuoer S12 Ultra.
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A four driver hybrid with two dynamic drivers, a Knowles balanced armature and a micro planar.
Amazon $139.00 eBay
The median of 12 hobbyist measurements gives it a solid Harman preference score of 69 with a 2.18 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $152.10 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
| Kinera Celest Yaksha | Letshuoer S12 Ultra | |
|---|---|---|
| Price | $139.00 | $152.10 |
| Ranked | #727 of 1291 in In-Ear Headphones | #707 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Planar |
| Drivers | 2 x dynamic + 1 x balanced armature + 1 x micro planar | 1 x 14.8mm planar magnetic |
| Harman Preference Score | 69 (median of 10 squig.link measurements, calibrated to AutoEQ) | 69 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.18 dB standard deviation | 2.18 dB standard deviation |
| Tonal Tilt | -0.71 (negative is warmer, positive brighter) | -0.68 (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 (+2.1 dB at 30 Hz) |
| Impedance | - | 16 ohms |
| Frequency Response | - | 20Hz - 40kHz (Manufacturer specified) |
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 Kinera Celest Yaksha from arn, atechreviews, audioamigo, dl, gadgetgenerations, hbb, jaytiss, pw, soundcheck39 and tonedeafmonk; the Letshuoer S12 Ultra from aden, atechreviews, audioamigo, cqtek, eplv, flare, hbb, jaytiss, pw, soundignity, superreview and tonedeafmonk, all via squig.link.
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