Short answer: the 64 Audio U4s. It ranks #629 of 1291 in-ear headphones by sound quality, rated 3.7/5, at $1,199; the ThieAudio Prestige ranks #736, rated 3.6/5, and costs $1,299, so there is little reason to consider the other one.
What the 64 Audio U4s does well: The U4s pairs one dynamic driver with three balanced armatures for a warm, bassy tuning, with bass, low mids and air all within half a decibel of target in squig.link hobbyist measurements. The catch: The presence region sits about 5.7 dB under target with a 7 dB dip near 5.1 kHz, so vocals lose bite and instruments sound veiled.
What the ThieAudio Prestige does well: A tribrid flagship with four electrostatic tweeters, four balanced armatures and a dynamic driver. The tradeoff: Very expensive for its rating, and a low 95 dB sensitivity needs more volume.
Buy the 64 Audio U4s. It is rated higher for sound quality than the ThieAudio Prestige and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Headphones rankings.
The U4s pairs one dynamic driver with three balanced armatures for a warm, bassy tuning, with bass, low mids and air all within half a decibel of target in squig.link hobbyist measurements.
64 Audio $1,199.00 eBay
A tribrid flagship with four electrostatic tweeters, four balanced armatures and a dynamic driver.
Linsoul $1,299.00 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
| 64 Audio U4s | ThieAudio Prestige | |
|---|---|---|
| Price | $1,199.00 | $1,299.00 |
| Ranked | #629 of 1291 in In-Ear Headphones | #736 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 70 (median of 22 squig.link measurements, calibrated to AutoEQ) | 69 (median of 9 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.27 dB standard deviation | 2.10 dB standard deviation |
| Tonal Tilt | -0.48 (negative is warmer, positive brighter) | -0.79 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) | Tribrid |
| Drivers | 1 x dynamic + 3 x balanced armature | 1 x dynamic + 4 x balanced armature + 4 x electrostatic |
| Impedance | 11 ohms | 11 ohms |
| Sensitivity | 107 dB/mW | 95 dB @1kHz |
| Frequency Response | 10Hz - 20kHz (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 64 Audio U4s from aden, aftersound, audioamigo, breampike, ekaudio, freeryder05, gadgetrytech, iemocean, iemworld, isaiahse, jaytiss, lown-fi, mmagtech, obodio, precog, recode, smirk, soundignity, superreview, therollo9, vsg and zerostresslevel; the ThieAudio Prestige from atechreviews, bloomaudio, eliseaudio, hbb, precog, seanwee, sl0the, timmyv and vsg, all via squig.link.
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