Short answer: the iBasso IT01S. It ranks #863 of 1291 in-ear headphones by sound quality, rated 3.4/5, at $89.95; the Tangzu Fudu ranks #911, rated 3.3/5, at $89. Close enough in price that the sound-quality gap is the deciding factor.
The case for the iBasso IT01S: A Harman score of 66 in Crinacle’s measurement shows the tuning lands reasonably close to what most listeners prefer. The tradeoff: Deviation from the target averages 2.84 dB, so the response is not especially smooth.
What the Tangzu Fudu does well: Bass is lifted about 2.7 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The tradeoff: Presence sits about 3.7 dB low with a 5.9 dB dip near 5.9 kHz, so vocals and instruments lose some bite.
Buy the iBasso IT01S. It is rated higher for sound quality, and the $0.95 you would save on the Tangzu Fudu does not close the gap.
Looking for alternatives? See the complete Headphones rankings.
A Harman score of 66 in Crinacle’s measurement shows the tuning lands reasonably close to what most listeners prefer.
Amazon $89.95 eBay
Bass is lifted about 2.7 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Amazon $89.00 eBayPrices on this page were last checked October 16, 2026 at 5:46 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
| iBasso IT01S | Tangzu Fudu | |
|---|---|---|
| Price | $89.95 | $89.00 |
| Ranked | #863 of 1291 in In-Ear Headphones | #911 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 66 (measured by crinacle, via AutoEQ) | 65 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.84 dB standard deviation | 2.41 dB standard deviation |
| Tonal Tilt | -0.22 (negative is warmer, positive brighter) | -0.88 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 2 x balanced armature |
| Impedance | 16 ohms | 16 ohms |
| Sensitivity | 109 dB/mW | - |
| Weight | 0 lbs (8 g) per earbud | - |
| Frequency Response | 10Hz - 43kHz (Manufacturer specified) | - |
| Built-in Microphone | No | - |
| Back | Closed | Closed |
| Sub-bass Extension | - | Within 6 dB of target down to 20 Hz (+0.9 dB at 30 Hz) |
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