Short answer: the Symphonium Zenith. Both are rated 4.2/5 for sound quality (#301 and #268 of 1291 in-ear headphones), and the Symphonium Zenith costs $1,799 against $1,999 for the Fatfreq Hayabusa, with sound quality a draw, the lower price decides it.
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.
The case for the Symphonium Zenith: A four balanced armature flagship whose bass sits right on the Harman target, with full sub-bass to 20 Hz unusual for an all-BA IEM (score 76). The catch: Treble sits about 3.6 dB below target, so it sounds relaxed and less detailed up top.
Buy the Symphonium Zenith. Both are rated the same for sound quality, and it costs $200 less than the Fatfreq Hayabusa.
Looking for alternatives? See the complete Headphones rankings.
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 four balanced armature flagship whose bass sits right on the Harman target, with full sub-bass to 20 Hz unusual for an all-BA IEM (score 76).
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Specifications Side By Side
| Fatfreq Hayabusa | Symphonium Zenith | |
|---|---|---|
| Price | $1,999.00 | $1,799 |
| Ranked | #268 of 1291 in In-Ear Headphones | #301 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 76 (measured by crinacle, via AutoEQ) | 76 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.94 dB standard deviation | 1.64 dB standard deviation |
| Tonal Tilt | +0.29 (negative is warmer, positive brighter) | -0.53 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | - | Balanced Armature |
| Drivers | - | 4 x balanced armature (TrueX 4-way crossover) |
| Impedance | - | 6.1 ohms |
| Sensitivity | - | 108 dB/Vrms |
| Sub-bass Extension | - | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) |
| Frequency Response | - | 10Hz - 20kHz |
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