Short answer: a tie on sound quality. Both are rated 4.0/5 (#243 and #263 of 450 in-ear headphones) at nearly the same price ($23.99 vs $26.99), so choose on features and fit.
Why pick the KZ ZSN Pro X: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. Watch for: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume.
Buy the KZ ZSN Pro X or the Letshuoer D02 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.
Specifications Side By Side
| KZ ZSN Pro X | Letshuoer D02 | |
|---|---|---|
| Price | $23.99 | $26.99 |
| Ranked | #243 of 450 in In-Ear Headphones | #263 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 74 (measured by oratory1990, via AutoEQ) | 74 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.09 dB standard deviation | 2.01 dB standard deviation |
| Tonal Tilt | -0.17 (negative is warmer, positive brighter) | +0.33 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature | 1 x 11mm dynamic |
| Impedance | 25 ohms | 26 ohms |
| Sensitivity | 112 dB/mW | 108 dB |
| Frequency Response | 7Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
Related Headphone Comparisons
More worthwhile head-to-heads for KZ ZSN Pro X:
- 7Hz Salnotes Zero vs KZ ZSN Pro X
- KZ ZSN Pro 2 vs KZ ZSN Pro X
- KZ ZSN Pro X vs 7Hz x Crinacle Zero 2
- KZ ZSN Pro X vs KZ ZSN Pro
- Letshuoer D02 vs 7Hz x Crinacle Zero 2
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 ZSN Pro X: $23.99 Amazon eBay
Pros: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. A preference score of 74 at an inexpensive price is strong, and the 25 ohm impedance with 112 dB/mW sensitivity makes it easy to drive from a phone. It also suits a warm or v-shaped taste.
Cons: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume. The 3 to 4 kHz region dips about 2.9 dB, so vocals can sound a little distant. It has no wireless features or noise cancelling.
Full KZ ZSN Pro X review and specifications →
| Released | Jul 2020 (6 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.09 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 7Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 74 (measured by oratory1990, via AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 112 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Tonal Tilt | -0.17 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -3.8 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +0.8 dB | 0.70 |
| Peak | 928 Hz | +5.3 dB | 0.66 |
| Peak | 166 Hz | -3.4 dB | 0.67 |
| Peak | 2,193 Hz | -4.4 dB | 0.61 |
| Peak | 3,392 Hz | +6.1 dB | 2.82 |
| High shelf | 10,000 Hz | -4.4 dB | 0.70 |
| Peak | 6,459 Hz | +3.5 dB | 5.25 |
| Peak | 4,968 Hz | -3.5 dB | 5.59 |
| Peak | 4,039 Hz | +1.3 dB | 6.00 |
| Peak | 5,964 Hz | +0.9 dB | 5.91 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Letshuoer D02: $26.99 Letshuoer eBay
Full Letshuoer D02 review and specifications →
| Released | Aug 2025 (1 year ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.01 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 11mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 74 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 26 ohms |
| Sensitivity | 108 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.4 dB at 30 Hz) |
| Tonal Tilt | +0.33 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons