Short answer: a tie on sound quality. Both are rated 3.7/5 (#634 and #666 of 1291 in-ear headphones) at nearly the same price ($54.99 vs $50.99), so choose on features and fit.
Why pick the KZ ZS10 Pro 2: The median of 9 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.13 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The catch: An 8 dB peak near 10.9 kHz can make cymbals and sibilance sound sharp.
What the TRN Shell does well: A budget hybrid with three dynamic drivers and a planar, plus three swappable tuning nozzles. The catch: A 2.15 dB spread from the target still leaves some peaks and dips.
Buy the KZ ZS10 Pro 2 or the TRN Shell on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
The median of 9 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.13 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $54.99 eBay
A budget hybrid with three dynamic drivers and a planar, plus three swappable tuning nozzles.
Amazon $50.99 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
| KZ ZS10 Pro 2 | TRN Shell | |
|---|---|---|
| Price | $54.99 | $50.99 |
| Ranked | #634 of 1291 in In-Ear Headphones | #666 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 70 (median of 9 squig.link measurements, calibrated to AutoEQ) | 70 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.13 dB standard deviation | 2.15 dB standard deviation |
| Tonal Tilt | +0.80 (negative is warmer, positive brighter) | -0.61 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 4 balanced armature) | Hybrid |
| Drivers | 1 x 10mm dynamic + 4 x balanced armature | 3 x dynamic + 1 x 6mm planar |
| Sensitivity | 108 dB | - |
| 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 KZ ZS10 Pro 2 from arn, ekaudio, gadgetrytech, musicafe, obodio, pw, silicagel, tonedeafmonk and vortexreviews; the TRN Shell from atechreviews, audioamigo, digaoreviews, eplv, soundcheck39 and tonedeafmonk, all via squig.link.
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