Short answer: a tie on sound quality. Both are rated 3.9/5 (#534 and #466 of 1291 in-ear headphones) at nearly the same price ($25 vs $25.99), so choose on features and fit.
What the JCALLY Space does well: A budget single dynamic in-ear with a 10mm driver, a preference score of 72 and treble right on the Harman target. The tradeoff: Sub-bass falls about 3.7 dB short at 30 Hz.
What the KZ ZSN Pro does well: A preference score of 73 in HypetheSonics’ measurement is solid for a wired set this cheap, with a response that stays within about 2.2 dB of the Harman target. The tradeoff: Treble above 10 kHz runs about 6 dB hot, with a sharp 9.4 dB peak near 11 kHz that can make cymbals and hi-hats sound glassy or hissy.
Buy the JCALLY Space or the KZ ZSN Pro on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
A budget single dynamic in-ear with a 10mm driver, a preference score of 72 and treble right on the Harman target.
Headphone Zone eBay
A preference score of 73 in HypetheSonics’ measurement is solid for a wired set this cheap, with a response that stays within about 2.2 dB of the Harman target.
Amazon $25.99 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| JCALLY Space | KZ ZSN Pro | |
|---|---|---|
| Price | $25 | $25.99 |
| Ranked | #534 of 1291 in In-Ear Headphones | #466 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Harman Preference Score | 72 (median of 3 squig.link measurements, calibrated to AutoEQ) | 73 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 2.17 dB standard deviation | 2.23 dB standard deviation |
| Tonal Tilt | +0.43 (negative is warmer, positive brighter) | -0.11 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.1 dB at 30 Hz) |
| Impedance | - | 25 ohms |
| Sensitivity | - | 104 dB/mW |
| Frequency Response | - | 20Hz - 40kHz (Manufacturer specified) |
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 JCALLY Space from fernandagunsan, kuping-sensi and soundignity; the KZ ZSN Pro from achoreviews, aden, aftersound, ankramutt, eplv, hoods, isaiahse, lown-fi, melatonin, pw and superreview, all via squig.link.
Related Headphone Comparisons
More top alternatives to KZ ZSN Pro: