Short answer: a tie on sound quality. Both are rated 3.9/5 (#22 and #23 of 68 in-ear headphones) at nearly the same price ($24.99 vs $24.99), so choose on features and fit.
Why pick the 7Hz x Crinacle Zero 2: Crinacle’s measurement gives a preference score of 73 with a response that stays fairly even, a standard deviation of 1.99 dB around target. Watch for: The tilt of negative 0.71 is the warmest in this group, so treble detail and air can sound subdued.
The case for the KZ ZSN Pro: 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 7Hz x Crinacle Zero 2 or the KZ ZSN 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
| 7Hz x Crinacle Zero 2 | KZ ZSN Pro | |
|---|---|---|
| Price | $24.99 | $24.99 |
| Ranked | #22 of 68 in In-Ear Headphones | #23 of 68 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 73 (measured by crinacle, via AutoEQ) | 73 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 1.99 dB standard deviation | 2.23 dB standard deviation |
| Tonal Tilt | -0.71 (negative is warmer, positive brighter) | -0.11 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 32 ohms | 25 ohms |
| Sensitivity | 108 dB SPL/V | 104 dB/mW |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
Related Headphone Comparisons
More top alternatives to 7Hz x Crinacle Zero 2:
- 7Hz x Crinacle Zero 2 vs CCA CRA
- KZ ZSN Pro X vs KZ ZSN Pro
- CCA CRA vs KZ ZSN Pro
- Truthear x Crinacle Zero RED vs Tin HiFi T4
- Samsung Galaxy Buds2 vs Shuoer S12 Pro
Prices on this page were last checked October 10, 2026 at 5:37 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Headphones In Full
7Hz x Crinacle Zero 2: $24.99 Amazon eBay
Older model: the 7Hz Salnotes Zero (ranked higher, rated 4.8/5). See every 7Hz Zero generation.
Pros: Crinacle’s measurement gives a preference score of 73 with a response that stays fairly even, a standard deviation of 1.99 dB around target. A 10mm dynamic driver at 32 ohms and 108 dB SPL/V sensitivity runs from a phone with no amp. The low cost makes it an easy entry into wired in-ears.
Cons: The tilt of negative 0.71 is the warmest in this group, so treble detail and air can sound subdued. It has no wireless features, noise cancelling or listed microphone. The KZ ZSN Pro X has a higher rating at a similar price.
Full 7Hz x Crinacle Zero 2 review and specifications →
| Released | Nov 2023 (2 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.99 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 73 (measured by crinacle, via AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 108 dB SPL/V |
| Tonal Tilt | -0.71 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -4.4 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 | -1.1 dB | 0.70 |
| Peak | 6,290 Hz | +4.3 dB | 0.72 |
| Peak | 182 Hz | -2.3 dB | 1.03 |
| Peak | 1,916 Hz | -1.7 dB | 0.50 |
| Peak | 855 Hz | +1.8 dB | 1.59 |
| High shelf | 10,000 Hz | +0.9 dB | 0.70 |
| Peak | 67 Hz | +0.4 dB | 2.53 |
| Peak | 7,224 Hz | -1.2 dB | 5.84 |
| Peak | 5,811 Hz | +0.8 dB | 5.07 |
| Peak | 3,871 Hz | -0.3 dB | 2.41 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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 |
| 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 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons