Short answer: the Fatfreq Hayabusa. Both are rated 4.2/5 for sound quality (#268 and #259 of 1291 in-ear headphones), and the Fatfreq Hayabusa costs $1,999 against $2,300 for the Letshuoer Sonata, and with sound quality even, the cheaper one is the better buy.
The case for the Fatfreq Hayabusa: A preference score of 76 in crinacle’s measurement places its tuning reasonably close to the Harman target most listeners prefer. The catch: The response is uneven, at 1.94 dB standard deviation from target, so some frequency regions stand out or fall back.
What the Letshuoer Sonata does well: A tribrid flagship with isobaric dynamic woofers that measures well (score 77) with a tight 1.54 dB spread from the target. Watch for: Very expensive for a score that budget IEMs match, and treble sits about 2.2 dB below target.
Buy the Fatfreq Hayabusa. Both are rated the same for sound quality, and it costs $301 less than the Letshuoer Sonata.
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A preference score of 76 in crinacle’s measurement places its tuning reasonably close to the Harman target most listeners prefer.
FATfreq $1,999.00 eBay
A tribrid flagship with isobaric dynamic woofers that measures well (score 77) with a tight 1.54 dB spread from the target.
Letshuoer $2,300.00 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
| Fatfreq Hayabusa | Letshuoer Sonata | |
|---|---|---|
| Price | $1,999.00 | $2,300.00 |
| Ranked | #268 of 1291 in In-Ear Headphones | #259 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 76 (measured by crinacle, via AutoEQ) | 77 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.94 dB standard deviation | 1.54 dB standard deviation |
| Tonal Tilt | +0.29 (negative is warmer, positive brighter) | -0.69 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | - | Tribrid |
| Drivers | - | 2 x isobaric dynamic + 4 x balanced armature + 4 x electrostatic |
| Impedance | - | 22 ohms |
| Sensitivity | - | 102 dB SPL/mW |
| Sub-bass Extension | - | Within 6 dB of target down to 20 Hz (+1.7 dB at 30 Hz) |
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