Short answer: the 64 Audio U4s. Both are rated 3.7/5 for sound quality (#629 and #633 of 1291 in-ear headphones), and the 64 Audio U4s costs $1,199 against $1,499 for the Fatfreq Sakura, and with sound quality even, the cheaper one is the better buy.
The case for the 64 Audio U4s: 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 tradeoff: 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.
The case for the Fatfreq Sakura: Crinacle’s measurement gives it a preference score of 70, a reasonably close match to the response most listeners prefer. Watch for: A 2.6 dB standard deviation from target means the response is noticeably uneven in places.
Buy the 64 Audio U4s. Both are rated the same for sound quality, and it costs $300 less than the Fatfreq Sakura.
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
Crinacle’s measurement gives it a preference score of 70, a reasonably close match to the response most listeners prefer.
FATfreq $1,499.00 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 | Fatfreq Sakura | |
|---|---|---|
| Price | $1,199.00 | $1,499.00 |
| Ranked | #629 of 1291 in In-Ear Headphones | #633 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) | 70 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.27 dB standard deviation | 2.58 dB standard deviation |
| Tonal Tilt | -0.48 (negative is warmer, positive brighter) | -0.08 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) | - |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 3 balanced armature) | - |
| Drivers | 1 x dynamic + 3 x balanced armature | - |
| Impedance | 11 ohms | - |
| Sensitivity | 107 dB/mW | - |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | - |
| Built-in Microphone | - | No |
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