Short answer: a tie on sound quality. Both are rated 3.9/5 (#276 and #312 of 450 in-ear headphones) at nearly the same price ($24.99 vs $23), so choose on features and fit.
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 catch: 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 KZ ZSN Pro or the Sony WI-C100 on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| KZ ZSN Pro | Sony WI-C100 | |
|---|---|---|
| Price | $24.99 | $23.00 |
| Ranked | #276 of 450 in In-Ear Headphones | #312 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 73 (measured by HypetheSonics, via AutoEQ) | 72 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.23 dB standard deviation | 1.94 dB standard deviation |
| Tonal Tilt | -0.11 (negative is warmer, positive brighter) | -0.49 (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 (-2.2 dB at 30 Hz) |
| Connection | Wired | Wireless |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature | 1 x 9mm dynamic |
| Impedance | 25 ohms | - |
| Sensitivity | 104 dB/mW | - |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Back | Closed | Closed |
| Weight | - | 0 lbs (20 g) |
| Active Noise Cancelling | - | No |
| Battery Life | - | 25 hours (Manufacturer specified) |
| Bluetooth Version | - | 5.0 |
| Bluetooth Codecs | - | SBC, AAC |
| Built-in Microphone | - | Yes |
| IP Rating | - | IPX4 |
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How KZ ZSN Pro compares with other leading options:
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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 ZSN Pro: $24.99 Amazon eBay
Pros: 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. Bass sits roughly 3 dB above target from 60 to 200 Hz, adding punch to kick drums and bass guitar without muddying the lower midrange, which stays within 1 dB. At 25 ohms and 104 dB/mW it runs loudly from a phone, and the hybrid dynamic plus balanced armature design suits v-shaped and warm tastes. It also rates higher than the MEE Audio M6 Pro.
Cons: 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. A 3.7 dB dip near 3.4 kHz pulls vocals and snare snap slightly back. Listeners who want a flat, neutral tuning will find the bass and treble both exaggerated.
Full KZ ZSN Pro review and specifications →
| Released | 2019 (7 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.23 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 | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 73 (measured by HypetheSonics, via AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 104 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.1 dB at 30 Hz) |
| Tonal Tilt | -0.11 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -4.2 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 | +0.5 dB | 0.70 |
| Peak | 750 Hz | +3.7 dB | 0.88 |
| Peak | 160 Hz | -3.1 dB | 0.79 |
| Peak | 3,264 Hz | +4.4 dB | 3.80 |
| Peak | 2,073 Hz | -3.5 dB | 2.04 |
| High shelf | 10,000 Hz | -5.0 dB | 0.70 |
| Peak | 4,840 Hz | -4.2 dB | 6.00 |
| Peak | 6,161 Hz | +3.4 dB | 4.50 |
| Peak | 3,841 Hz | +1.8 dB | 5.81 |
| Peak | 4,626 Hz | -1.0 dB | 5.62 |
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Sony WI-C100: $23.00 Wireless Amazon eBay
Full Sony WI-C100 review and specifications →
| Active Noise Cancelling | No |
|---|---|
| Back | Closed |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Connection | Wireless |
| Deviation From Target | 1.94 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 9mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 72 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| IP Rating | IPX4 |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.2 dB at 30 Hz) |
| Tonal Tilt | -0.49 (negative is warmer, positive brighter) |
| Weight | 0 lbs (20 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons