Short answer: a tie on sound quality. Both are rated 3.6/5 (#707 and #775 of 1291 in-ear headphones) at nearly the same price ($152.10 vs $149.99), so choose on features and fit.
Why pick 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.
Why pick the TOZO Golden X1: A broadly balanced tuning with a preference score of 68 against the Harman target. The catch: An uneven response, 2.1 dB standard deviation from target.
Buy the Letshuoer S12 Ultra or the TOZO Golden X1 on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
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 eBay
A broadly balanced tuning with a preference score of 68 against the Harman target.
Amazon $149.99 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
| Letshuoer S12 Ultra | TOZO Golden X1 | |
|---|---|---|
| Price | $152.10 | $149.99 |
| Ranked | #707 of 1291 in In-Ear Headphones | #775 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Bluetooth |
| Driver Type | Planar | Hybrid |
| Drivers | 1 x 14.8mm planar magnetic | 1 Dynamic (12mm), 1 Balanced Armature |
| Impedance | 16 ohms | - |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | - |
| Harman Preference Score | 69 (median of 12 squig.link measurements, calibrated to AutoEQ) | 68 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.18 dB standard deviation | 2.11 dB standard deviation |
| Tonal Tilt | -0.68 (negative is warmer, positive brighter) | -1.01 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+3.0 dB at 30 Hz) |
| Bluetooth | - | Yes |
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 Letshuoer S12 Ultra from aden, atechreviews, audioamigo, cqtek, eplv, flare, hbb, jaytiss, pw, soundignity, superreview and tonedeafmonk; the TOZO Golden X1 from boizoff, fernandagunsan and vortexreviews, all via squig.link.
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