Short answer: the FiiO FD11. It ranks #924 of 1369 in-ear headphones by sound quality, rated 3.3/5, at $32.99; the IvipQ IE-01 ranks #1048, rated 3.1/5, and costs $35, which makes this an easy call rather than a real tradeoff.
What the FiiO FD11 does well: Bass is lifted about 3.6 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. Watch for: Its 2.40 dB spread is less even than the best measured sets.
The case for the IvipQ IE-01: About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. The tradeoff: An uneven response, 2.4 dB standard deviation from target.
Buy the FiiO FD11. It is rated higher for sound quality than the IvipQ IE-01 and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Headphones rankings cover every ranked option.
Bass is lifted about 3.6 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Amazon $32.99 eBay
About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
AliExpress $35 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 FD11 | IvipQ IE-01 | |
|---|---|---|
| Price | $32.99 | $35 |
| Ranked | #924 of 1369 in In-Ear Headphones | #1048 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic driver |
| Impedance | 24 ohms | 32 ohms |
| Sensitivity | 111 dB/mW | 124 dB/Vrms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 16Hz - 22kHz |
| Weight | 0 lbs (10 g) | 0 lbs (4.9 g) (per earbud) |
| Harman Preference Score | 65 (median of 13 squig.link measurements, calibrated to AutoEQ) | 63 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.40 dB standard deviation | 2.45 dB standard deviation |
| Tonal Tilt | -0.89 (negative is warmer, positive brighter) | -1.14 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+4.5 dB at 30 Hz) |
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 FD11 from adri-n, aftersound, ankramutt, arn, dchpgall, digaoreviews, ekaudio, fahryst, ianfann, mmagtech, superreview, theaudiostore and treblewellxtended; the IvipQ IE-01 from audioamigo, ducbloke and eplv, all via squig.link.
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