Short answer: the Roseselsa Quiet Sea II. Both are rated 3.2/5 for sound quality (#1004 and #999 of 1369 in-ear headphones), and the Roseselsa Quiet Sea II costs $62.99 against $69.99 for the FiiO FW3, so with nothing between them on sound quality, price settles it.
The case for the FiiO FW3: 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.
What the Roseselsa Quiet Sea II does well: About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. Watch for: An uneven response, 2.4 dB standard deviation from target.
Buy the Roseselsa Quiet Sea II. Both are rated the same for sound quality, and it costs $7 less than the FiiO FW3.
Looking for alternatives? See the complete Headphones rankings.
A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
Amazon $69.99 eBay
About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
HiFiGo $62.99 eBayPrices on this page were last checked October 17, 2026 at 6:04 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
| FiiO FW3 | Roseselsa Quiet Sea II | |
|---|---|---|
| Price | $69.99 | $62.99 |
| Ranked | #999 of 1369 in In-Ear Headphones | #1004 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 64 (median of 3 squig.link measurements, calibrated to AutoEQ) | 64 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.58 dB standard deviation | 2.43 dB standard deviation |
| Tonal Tilt | -0.50 (negative is warmer, positive brighter) | -0.95 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.0 dB at 30 Hz) |
| Connection | Wireless | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm carbon-based dynamic driver | 1 x 10mm dual-magnetic dual-cavity dynamic driver (PEEK substrate + carbon-copper vacuum-coated dome diaphragm) |
| Impedance | 32 ohms | 18 ohms |
| Sensitivity | 106 dB/mW | 106 dB/mW |
| Frequency Response | 20Hz - 20kHz | 20Hz - 20kHz |
| 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 FiiO FW3 from arn, ianfann and vsg; the Roseselsa Quiet Sea II from atechreviews, bassaudio, csi-zone, eplv, faxepremium, jaytiss and practiphile, all via squig.link.
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