Short answer: the Kinera Idun 2.0. It ranks #864 of 1369 in-ear headphones by sound quality, rated 3.4/5, at $69; the FiiO FW3 ranks #999, rated 3.2/5, and costs $69.99, so there is little reason to consider the other one.
Why pick the Kinera Idun 2.0: A broadly balanced tuning with a preference score of 67 against the Harman target. The catch: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
What the FiiO FW3 does well: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap. Watch for: An uneven response, 2.6 dB standard deviation from target.
Buy the Kinera Idun 2.0. It is rated higher for sound quality than the FiiO FW3 and costs less, which makes it the one to get unless you need something the other one does better.
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A broadly balanced tuning with a preference score of 67 against the Harman target.
Kinera eBay
A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
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Specifications Side By Side
| Kinera Idun 2.0 | FiiO FW3 | |
|---|---|---|
| Price | 69.00 | $69.99 |
| Ranked | #864 of 1369 in In-Ear Headphones | #999 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 67 (median of 3 squig.link measurements, calibrated to AutoEQ) | 64 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.80 dB standard deviation | 2.58 dB standard deviation |
| Tonal Tilt | +0.02 (negative is warmer, positive brighter) | -0.50 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.2 dB at 30 Hz) |
| Driver Type | Hybrid | Dynamic |
| Drivers | 1 dynamic driver + 2 balanced armatures (7mm titanium dome DD + Knowles RAF-32873 BA + custom BTC-30095 BA) | 1 x 10mm carbon-based dynamic driver |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 112 dB | 106 dB/mW |
| Frequency Response | 20Hz - 20kHz | 20Hz - 20kHz |
| Connection | Wired | Wireless |
| Weight | - | 0 lbs (6 g) (per earbud) |
| Bluetooth Version | - | 5.2 |
| Bluetooth Codecs | - | LDAC, LHDC, aptX Adaptive, aptX, AAC, SBC |
| Active Noise Cancelling | - | No |
| Battery Life | - | 7 hours (earbuds), 21 hours (with charging case) |
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 Kinera Idun 2.0 from awsmdanny, precog and soundcheck39; the FiiO FW3 from arn, ianfann and vsg, all via squig.link.
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