Short answer: a tie on sound quality. Both are rated 3.2/5 (#1004 and #1014 of 1369 in-ear headphones) at nearly the same price ($62.99 vs $58), so choose on features and fit.
The case for the Roseselsa Quiet Sea II: 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.
What the ZiSin 340 does well: About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. The tradeoff: An uneven response, 2.5 dB standard deviation from target.
Buy the Roseselsa Quiet Sea II or the ZiSin 340 on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
HiFiGo $62.99 eBay
About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
AliExpress $58.00 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Roseselsa Quiet Sea II | ZiSin 340 | |
|---|---|---|
| Price | $62.99 | $58.00 |
| Ranked | #1004 of 1369 in In-Ear Headphones | #1014 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 64 (median of 7 squig.link measurements, calibrated to AutoEQ) | 63 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.43 dB standard deviation | 2.54 dB standard deviation |
| Tonal Tilt | -0.95 (negative is warmer, positive brighter) | -0.90 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.2 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dual-magnetic dual-cavity dynamic driver (PEEK substrate + carbon-copper vacuum-coated dome diaphragm) | 1 x 10mm dynamic driver (dual-cavity gold-plated composite film) |
| Impedance | 18 ohms | 32 ohms |
| Sensitivity | 106 dB/mW | 123 dB/Vrms |
| Frequency Response | 20Hz - 20kHz | 10Hz - 26kHz |
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 Roseselsa Quiet Sea II from atechreviews, bassaudio, csi-zone, eplv, faxepremium, jaytiss and practiphile; the ZiSin 340 from audioamigo, ducbloke, jaytiss and soundcheck39, all via squig.link.
Related Headphone Comparisons
More worthwhile head-to-heads for Roseselsa Quiet Sea II: