Short answer: the CCA C10. Both are rated 3.7/5 for sound quality (#630 and #660 of 1291 in-ear headphones), and the CCA C10 costs $24.89 against $35.99 for the KZ Carol, and with sound quality even, the cheaper one is the better buy.
Why pick the CCA C10: Bass reaches all the way to 20 Hz within half a decibel of target on average, with a 3 dB lift from 60 to 200 Hz that gives drums and bass guitar body. Watch for: Across nine hobbyist measurements on squig.link a 7.5 dB peak near 8.1 kHz stands out, which can make cymbals and sibilance splashy.
Why pick the KZ Carol: Budget true wireless earbuds with hybrid noise cancelling and Bluetooth 5.4, about 7 hours per charge and 42 hours with the case. Watch for: A 2.37 dB spread from the target shows peaks and dips that better tuned sets avoid.
Buy the CCA C10. Both are rated the same for sound quality, and it costs $11.10 less than the KZ Carol.
Looking for alternatives? See the complete Headphones rankings.
Bass reaches all the way to 20 Hz within half a decibel of target on average, with a 3 dB lift from 60 to 200 Hz that gives drums and bass guitar body.
Amazon $40.99 AliExpress $24.89 Lowest eBay
Budget true wireless earbuds with hybrid noise cancelling and Bluetooth 5.4, about 7 hours per charge and 42 hours with the case.
Amazon $35.99 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
| CCA C10 | KZ Carol | |
|---|---|---|
| Price | $24.89 | $35.99 |
| Ranked | #630 of 1291 in In-Ear Headphones | #660 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 70 (measured by crinacle, via AutoEQ) | 70 (median of 9 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.31 dB standard deviation | 2.37 dB standard deviation |
| Tonal Tilt | -0.40 (negative is warmer, positive brighter) | -0.23 (negative is warmer, positive brighter) |
| Connection | Wired | True wireless |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature) | Dynamic |
| Drivers | 1 x 10mm dynamic + 4 x balanced armature | 1 x 10mm dynamic |
| Impedance | 32 ohms | - |
| Sensitivity | 108 dB/mW | - |
| Frequency Response | 7Hz - 40kHz (Manufacturer specified) | - |
| Back | Closed | Closed |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.8 dB at 30 Hz) |
| Bluetooth Version | - | 5.4 |
| Active Noise Cancelling | - | Yes |
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 CCA C10 from aftersound, bedrock, eplv, flare, hbb, melatonin, rg, soundignity and superreview; the KZ Carol from aftersound, audioamigo, dhrme, flare, gadgetrytech, obodio, practiphile, pw and regancipher, all via squig.link.
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