Short answer: the CCA CSN. It ranks #818 of 1291 in-ear headphones by sound quality, rated 3.5/5, at $25.99; the KZ EDX Ultra ranks #871, rated 3.4/5, at $24.99. Close enough in price that the sound-quality gap is the deciding factor.
Why pick the CCA CSN: Across six hobbyist measurements on squig.link, bass runs about 2 dB above target with sub-bass only 1.4 dB short at 30 Hz, giving a warm, full low end that suits pop and electronic music. The catch: A 6.9 dB dip near 3.4 kHz sets voices back, while a 5.5 dB peak at 8.1 kHz can make cymbals and sibilants splashy, a V-shaped balance that will not suit neutral tastes.
What the KZ EDX Ultra does well: Bass is lifted about 3.2 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. Watch for: Presence sits about 3.1 dB low with a 6.8 dB dip near 6.7 kHz, so vocals and instruments lose some bite.
Buy the CCA CSN. It is rated higher for sound quality, and the $1 you would save on the KZ EDX Ultra does not close the gap.
Looking for alternatives? See the complete Headphones rankings.
Across six hobbyist measurements on squig.link, bass runs about 2 dB above target with sub-bass only 1.4 dB short at 30 Hz, giving a warm, full low end that suits pop and electronic music.
Amazon $25.99 eBay
Bass is lifted about 3.2 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 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 CSN | KZ EDX Ultra | |
|---|---|---|
| Price | $25.99 | $24.99 |
| Ranked | #818 of 1291 in In-Ear Headphones | #871 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 67 (measured by crinacle, via AutoEQ) | 66 (median of 13 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.64 dB standard deviation | 2.40 dB standard deviation |
| Tonal Tilt | -0.46 (negative is warmer, positive brighter) | -0.75 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature | 1 x 10mm dynamic |
| Impedance | 22.5 ohms | 26 ohms |
| Sensitivity | 112 dB/mW | - |
| Frequency Response | 20Hz - 40kHz | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.0 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 CCA CSN from aftersound, bedrock, melatonin, precog, pw and vortexreviews; the KZ EDX Ultra from aftersound, ankramutt, bassyalexander, harpo, ianfann, jacstone, lown-fi, precog, pw, rg, soundcheck39, soundignity and vortexreviews, all via squig.link.
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