Short answer: the iBasso IT01S. Both are rated 3.4/5 for sound quality (#863 and #886 of 1291 in-ear headphones), and the iBasso IT01S costs $89.95 against $99 for the KBear Tourbillon Pro, so with nothing between them on sound quality, price settles it.
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 catch: Deviation from the target averages 2.84 dB, so the response is not especially smooth.
The case for the KBear Tourbillon Pro: A broadly balanced tuning with a preference score of 66 against the Harman target. Watch for: Treble about 2 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the iBasso IT01S. Both are rated the same for sound quality, and it costs $9.05 less than the KBear Tourbillon Pro.
Still deciding? The full Headphones rankings cover every ranked option.
A Harman score of 66 in Crinacle’s measurement shows the tuning lands reasonably close to what most listeners prefer.
Amazon $89.95 eBay
A broadly balanced tuning with a preference score of 66 against the Harman target.
KeepHiFi $99.00 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 | KBear Tourbillon Pro | |
|---|---|---|
| Price | $89.95 | $99.00 |
| Ranked | #863 of 1291 in In-Ear Headphones | #886 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 66 (measured by crinacle, via AutoEQ) | 66 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.84 dB standard deviation | 2.32 dB standard deviation |
| Tonal Tilt | -0.22 (negative is warmer, positive brighter) | -0.89 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic driver (PU + PEEK + DLC composite diaphragm) |
| Impedance | 16 ohms | 19 ohms |
| Sensitivity | 109 dB/mW | 101 dB/mW |
| Weight | 0 lbs (8 g) per earbud | - |
| Frequency Response | 10Hz - 43kHz (Manufacturer specified) | 20Hz - 20kHz |
| Built-in Microphone | No | - |
| Back | Closed | Closed |
| Sub-bass Extension | - | Within 6 dB of target down to 20 Hz (+0.5 dB at 30 Hz) |
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