Short answer: a tie on sound quality. Both are rated 3.6/5 (#719 and #693 of 1291 in-ear headphones) at nearly the same price ($1,399 vs $1,399), so choose on features and fit.
What the 64 Audio Solo does well: The single 14.2mm planar driver reaches full depth, sitting within 0.3 dB of target from 20 to 60 Hz on the median of nine squig.link measurements, so bass notes keep their weight without being pumped up. The catch: A dip of 6.4 dB near 3.5 kHz pulls the presence region 5.5 dB below target, so vocals and guitars sound distant and lack bite.
The case for the SeeAudio Kaguya: A preference score of 69 from crinacle and a 2.2 dB standard deviation give it a fairly even response for a premium hybrid. The tradeoff: A 10.8 dB peak near 10 kHz in squig.link measurements can make cymbals and hi-hats sound glassy or hissy to treble-sensitive listeners.
Buy the 64 Audio Solo or the SeeAudio Kaguya on features: they are rated the same for sound quality at close to the same price.
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The single 14.2mm planar driver reaches full depth, sitting within 0.3 dB of target from 20 to 60 Hz on the median of nine squig.link measurements, so bass notes keep their weight without being pumped up.
Headphones.com $1,399.00 eBay
A preference score of 69 from crinacle and a 2.2 dB standard deviation give it a fairly even response for a premium hybrid.
Linsoul $1,399.00 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 Solo | SeeAudio Kaguya | |
|---|---|---|
| Price | $1,399.00 | $1,399.00 |
| Ranked | #719 of 1291 in In-Ear Headphones | #693 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (median of 9 squig.link measurements, calibrated to AutoEQ) | 69 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.29 dB standard deviation | 2.22 dB standard deviation |
| Tonal Tilt | -0.64 (negative is warmer, positive brighter) | -0.56 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Planar magnetic | Hybrid (4 balanced armature + 4 electrostatic) |
| Drivers | 1 x 14.2mm planar magnetic | 4 x balanced armature + 4 x electrostatic |
| Impedance | 12 ohms | 28 ohms |
| Sensitivity | 100 dB @ 1kHz | 103 dB/mW |
| Frequency Response | - | 20Hz - 40kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
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 Solo from bloomaudio, elrics, hbb, jaytiss, precog, superreview, theaudiostore, treblewellxtended and vsg; the SeeAudio Kaguya from aftersound, elrics and recode, all via squig.link.
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