Short answer: the CCA Hydro. It ranks #960 of 1369 in-ear headphones by sound quality, rated 3.3/5, at $24.99; the KBEAR KS2 ranks #1079, rated 3.0/5, at $24.99. The price gap is small enough that the sound-quality ranking should decide it.
What the CCA Hydro 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.
What the KBEAR KS2 does well: Bass is lifted about 5.9 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The catch: A 10.1 dB peak near 7.9 kHz can make cymbals and sibilance sound sharp.
Buy the CCA Hydro. It is rated higher for sound quality than the KBEAR KS2 at the same price, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Headphones rankings.
About 3 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
Linsoul eBay
Bass is lifted about 5.9 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Amazon $24.99 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
| CCA Hydro | KBEAR KS2 | |
|---|---|---|
| Price | 24.99 | $24.99 |
| Ranked | #960 of 1369 in In-Ear Headphones | #1079 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 65 (median of 4 squig.link measurements, calibrated to AutoEQ) | 61 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.54 dB standard deviation | 2.66 dB standard deviation |
| Tonal Tilt | -0.37 (negative is warmer, positive brighter) | -0.67 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+4.4 dB at 30 Hz) |
| Driver Type | Hybrid | Hybrid |
| Drivers | 10 drivers (2 dynamic drivers + 8 balanced armatures) | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 15-20 ohms | 16 ohms |
| Sensitivity | 102 dB | - |
| Frequency Response | 20Hz - 40kHz | 20Hz - 20kHz |
| Connection | Wired | Wired |
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 Hydro from audioamigo, obodio, pw and superreview; the KBEAR KS2 from aftersound, bedrock, bryaudioreviews, cqtek, dchpgall, hbb, ianfann, pw, rg, superreview and vortexreviews, all via squig.link.
Related Headphone Comparisons
More worthwhile head-to-heads for CCA Hydro: