Short answer: the Letshuoer S15. Both are rated 3.2/5 for sound quality (#946 and #950 of 1291 in-ear headphones), and the Letshuoer S15 costs $329 against $349 for the Shure Aonic 4, with sound quality a draw, the lower price decides it.
Why pick the Letshuoer S15: Its 14.8 mm planar driver keeps bass full, about 2 dB above target, and the lower mids accurate across 26 measurements. The tradeoff: The presence region is about 6 dB low with a 7.1 dB dip near 3.6 kHz, so vocals sound distant.
What the Shure Aonic 4 does well: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. The tradeoff: Presence sits about 5.7 dB low with a 9.6 dB dip near 5.9 kHz, so vocals and instruments lose some bite.
Buy the Letshuoer S15. Both are rated the same for sound quality, and it costs $20 less than the Shure Aonic 4.
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Its 14.8 mm planar driver keeps bass full, about 2 dB above target, and the lower mids accurate across 26 measurements.
Linsoul $329.00 eBay
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
Amazon $349.00 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
| Letshuoer S15 | Shure Aonic 4 | |
|---|---|---|
| Price | $329.00 | $349.00 |
| Ranked | #946 of 1291 in In-Ear Headphones | #950 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | - |
| Connection | Wired | Wired |
| Driver Type | Planar | Hybrid |
| Drivers | 1 x 14.8mm planar magnetic + passive radiator | 1 x dynamic + 1 x balanced armature |
| Impedance | 30 ohms | 7 ohms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 19kHz |
| Harman Preference Score | 64 (median of 26 squig.link measurements, calibrated to AutoEQ) | 64 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.74 dB standard deviation | 2.83 dB standard deviation |
| Tonal Tilt | -0.63 (negative is warmer, positive brighter) | -0.59 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-4.0 dB at 30 Hz) |
| Sensitivity | - | 106 dB/mW |
| Weight | - | 0 lbs (21.1 g) |
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 S15 from achoreviews, aden, aftersound, ankramutt, arn, atechreviews, audioamigo, cqtek, csi-zone, dchpgall, digaoreviews, eliseaudio, hbb, jaytiss, koi, mmagtech, obodio, practiphile, precog, pw, recode, soundcheck39, soundignity, superreview, therollo9 and tonedeafmonk; the Shure Aonic 4 from aden, ekaudio and hu-fi, all via squig.link.
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