Short answer: a tie on sound quality. Both are rated 4.4/5 (#101 and #125 of 450 in-ear headphones) at nearly the same price ($51.25 vs $55.99), so choose on features and fit.
The case for the KZ PR2: Its 13.2 mm planar driver scores 78.8 in the median of 13 squig.link measurements, with bass and mids held within about 1 dB of target from 20 Hz to 3 kHz. Watch for: At 94 dB sensitivity it needs noticeably more volume than most in-ears, so weak phone outputs may run out of headroom.
Buy the KZ PR2 or the KZ ZEX 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.
Specifications Side By Side
| KZ PR2 | KZ ZEX Pro | |
|---|---|---|
| Price | $51.25 | $55.99 |
| Ranked | #101 of 450 in In-Ear Headphones | #125 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 79 (median of 13 squig.link measurements, calibrated to AutoEQ) | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.61 dB standard deviation | 1.58 dB standard deviation |
| Tonal Tilt | -0.15 (negative is warmer, positive brighter) | -0.26 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Planar magnetic | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) |
| Drivers | 1 x 13.2mm planar magnetic | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic |
| Impedance | 15 ohms | 25 ohms |
| Sensitivity | 94 dB | 104 dB |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
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Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
KZ PR2: $51.25 Amazon eBay
Pros: Its 13.2 mm planar driver scores 78.8 in the median of 13 squig.link measurements, with bass and mids held within about 1 dB of target from 20 Hz to 3 kHz. Sub-bass sits 0.9 dB above target and extends fully to 20 Hz, so it delivers clean, solid low end. A strong 7.4 dB lift in the air band gives an open, detailed top that suits listeners who like a v-shaped sparkle.
Cons: At 94 dB sensitivity it needs noticeably more volume than most in-ears, so weak phone outputs may run out of headroom. The 6.4 dB peak near 10 kHz alongside a 4.3 dB dip near 6.7 kHz can make treble sound uneven, with cymbals that sizzle while some vocal edge recedes.
Full KZ PR2 review and specifications →
| Released | Apr 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.61 dB standard deviation |
| Driver Type | Planar magnetic |
| Drivers | 1 x 13.2mm planar magnetic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 79 (median of 13 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 15 ohms |
| Sensitivity | 94 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.9 dB at 30 Hz) |
| Tonal Tilt | -0.15 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KZ ZEX Pro: $55.99 Amazon eBay
Full KZ ZEX Pro review and specifications →
| Released | 2021 (5 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.58 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 104 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Tonal Tilt | -0.26 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons