Short answer: the Sony WF-C510. It ranks #697 of 1369 in-ear headphones by sound quality, rated 3.6/5, at $68; the Kinera Idun 2.0 ranks #864, rated 3.4/5, and costs $69, so there is little reason to consider the other one.
What the Sony WF-C510 does well: In hobbyist measurements on squig.link it tracks the Harman target closely through the bass and mids, with a preference score of 69 and no peak above target between 1.5 and 12 kHz, so it never sounds harsh. The catch: There is no active noise cancelling, and codec support stops at SBC and AAC.
Why pick the Kinera Idun 2.0: A broadly balanced tuning with a preference score of 67 against the Harman target. The tradeoff: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the Sony WF-C510. It is rated higher for sound quality than the Kinera Idun 2.0 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
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In hobbyist measurements on squig.link it tracks the Harman target closely through the bass and mids, with a preference score of 69 and no peak above target between 1.5 and 12 kHz, so it never sounds harsh.
Amazon $68.00 Lowest Sony $69.99 eBay
A broadly balanced tuning with a preference score of 67 against the Harman target.
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Specifications Side By Side
| Sony WF-C510 | Kinera Idun 2.0 | |
|---|---|---|
| Price | $68.00 | 69.00 |
| Ranked | #697 of 1369 in In-Ear Headphones | #864 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (median of 1 squig.link measurements, calibrated to AutoEQ) | 67 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.47 dB standard deviation | 2.80 dB standard deviation |
| Tonal Tilt | -0.30 (negative is warmer, positive brighter) | +0.02 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-4.3 dB at 30 Hz) |
| Connection | True wireless | Wired |
| Driver Type | Dynamic | Hybrid |
| Drivers | 1 x 6mm dynamic | 1 dynamic driver + 2 balanced armatures (7mm titanium dome DD + Knowles RAF-32873 BA + custom BTC-30095 BA) |
| Weight | 0 lbs (4.6 g) per earbud | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz |
| Active Noise Cancelling | No | - |
| Battery Life | 11 hours (22 with case, Manufacturer specified) | - |
| Bluetooth Version | 5.3 | - |
| Bluetooth Codecs | SBC, AAC | - |
| Built-in Microphone | Yes | - |
| IP Rating | IPX4 | - |
| Impedance | - | 32 ohms |
| Sensitivity | - | 112 dB |
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