Short answer: a tie on sound quality. Both are rated 3.7/5 (#645 and #655 of 1291 in-ear headphones) at nearly the same price ($71.99 vs $72.90), so choose on features and fit.
The case for the KZ PRX: The median of 14 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.10 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. The tradeoff: A 6.1 dB peak near 8.4 kHz can make cymbals and sibilance sound sharp.
Why pick the Twistura Sigma: Nine hobbyist measurements give this one dynamic plus one balanced armature hybrid a preference score of 70 with a smooth 2.21 dB deviation, so the midrange sounds natural. The tradeoff: Treble falls about 3 dB and air about 4 dB below target, with an 8.4 dB dip near 11.9 kHz, so cymbals and spacious recordings lose sparkle.
Buy the KZ PRX or the Twistura Sigma on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
The median of 14 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.10 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural.
Amazon $71.99 eBay
Nine hobbyist measurements give this one dynamic plus one balanced armature hybrid a preference score of 70 with a smooth 2.21 dB deviation, so the midrange sounds natural.
Amazon $72.90 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 PRX | Twistura Sigma | |
|---|---|---|
| Price | $71.99 | $72.90 |
| Ranked | #645 of 1291 in In-Ear Headphones | #655 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Planar | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x planar magnetic | 1 x 6mm dynamic + 1 x balanced armature |
| Impedance | 15 ohms | 26 ohms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 15Hz - 37kHz (Manufacturer specified) |
| Harman Preference Score | 70 (median of 14 squig.link measurements, calibrated to AutoEQ) | 70 (median of 9 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.10 dB standard deviation | 2.21 dB standard deviation |
| Tonal Tilt | -0.66 (negative is warmer, positive brighter) | -0.18 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.6 dB at 30 Hz) |
| Sensitivity | - | 107 dB |
| Built-in Microphone | - | No |
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 PRX from aftersound, audioamigo, breampike, enemyspider, eplv, jaytiss, lown-fi, obodio, pw, sl0the, soundcheck39, soundignity, treblewellxtended and vortexreviews; the Twistura Sigma from aftersound, bassaudio, boizoff, hu-fi, kuping-sensi, pw, soundcheck39, soundignity and vortexreviews, all via squig.link.
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