Short answer: the 7Hz x Crinacle Zero 2. It ranks #275 of 450 in-ear headphones by sound quality, rated 3.9/5, at $24.99; the CCA CSN ranks #356, rated 3.5/5, and costs $25.99, so there is little reason to consider the other one.
The 7Hz x Crinacle Zero 2 is the better-sounding choice. Crinacle’s measurement gives it a preference score of 73, and an average deviation of just 2 dB from the Harman target is unusually even for a budget single dynamic driver. The tradeoff: Hobbyist measurements show the presence region about 3 dB shy of target with a 4.7 dB dip near 5.9 kHz, which can make guitars and vocal consonants sound a little veiled.
Why pick the CCA CSN: Across six hobbyist measurements on squig.link, bass runs about 2 dB above target with sub-bass only 1.4 dB short at 30 Hz, giving a warm, full low end that suits pop and electronic music. Watch for: A 6.9 dB dip near 3.4 kHz sets voices back, while a 5.5 dB peak at 8.1 kHz can make cymbals and sibilants splashy, a V-shaped balance that will not suit neutral tastes.
Buy the 7Hz x Crinacle Zero 2. It is rated higher for sound quality than the CCA CSN and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| 7Hz x Crinacle Zero 2 | CCA CSN | |
|---|---|---|
| Price | $24.99 | $25.99 |
| Ranked | #275 of 450 in In-Ear Headphones | #356 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 73 (measured by crinacle, via AutoEQ) | 67 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 1.99 dB standard deviation | 2.64 dB standard deviation |
| Tonal Tilt | -0.71 (negative is warmer, positive brighter) | -0.46 (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 | 22.5 ohms |
| Sensitivity | 108 dB SPL/V | 112 dB/mW |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz |
| Back | Closed | Closed |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
Related Headphone Comparisons
More worthwhile head-to-heads for 7Hz x Crinacle Zero 2:
- KZ ZSN Pro X vs 7Hz x Crinacle Zero 2
- Letshuoer D02 vs 7Hz x Crinacle Zero 2
- 7Hz x Crinacle Zero 2 vs KZ ZSN Pro
- 7Hz x Crinacle Zero 2 vs DUNU Titan S
- 7Hz x Crinacle Zero 2 vs CCA CRA
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
7Hz x Crinacle Zero 2: $24.99 Amazon AliExpress eBay
Older model: the 7Hz Salnotes Zero (ranked higher, rated 4.8/5). See every 7Hz Zero generation.
Pros: Crinacle’s measurement gives it a preference score of 73, and an average deviation of just 2 dB from the Harman target is unusually even for a budget single dynamic driver. Across four hobbyist measurements on squig.link, bass sits about 1.8 dB above target and sub-bass reaches flat to 20 Hz, so kick drums and synth lines have a gentle, full weight without swamping vocals. The mildly warm balance suits listeners who like a relaxed, bassy tilt over a bright one.
Cons: Hobbyist measurements show the presence region about 3 dB shy of target with a 4.7 dB dip near 5.9 kHz, which can make guitars and vocal consonants sound a little veiled. A 4.2 dB lift near 11.9 kHz adds some sparkle on top that can draw attention to cymbals. The KZ ZSN Pro X rates slightly higher 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 |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| 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
CCA CSN: $25.99 Amazon eBay
Pros: Across six hobbyist measurements on squig.link, bass runs about 2 dB above target with sub-bass only 1.4 dB short at 30 Hz, giving a warm, full low end that suits pop and electronic music. Crinacle’s measurement returns a preference score of 67, respectable for an inexpensive hybrid of a 10 mm dynamic driver and a balanced armature. At 22.5 ohms and 112 dB/mW it gets loud from any phone.
Cons: A 6.9 dB dip near 3.4 kHz sets voices back, while a 5.5 dB peak at 8.1 kHz can make cymbals and sibilants splashy, a V-shaped balance that will not suit neutral tastes. The KZ ZST costs a little less and is rated higher, as are the CCA C10 and MEE Audio M6 Pro for a modest step up.
Full CCA CSN review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.64 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 |
| Harman Preference Score | 67 (measured by crinacle, via AutoEQ) |
| Impedance | 22.5 ohms |
| Sensitivity | 112 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| Tonal Tilt | -0.46 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.7 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 | 164 Hz | -3.5 dB | 0.59 |
| Peak | 3,200 Hz | +7.0 dB | 1.48 |
| Peak | 1,878 Hz | -6.0 dB | 1.38 |
| Peak | 809 Hz | +2.8 dB | 0.77 |
| High shelf | 10,000 Hz | +3.1 dB | 0.70 |
| Peak | 5,170 Hz | -4.2 dB | 5.86 |
| Peak | 6,353 Hz | +2.7 dB | 6.00 |
| Peak | 4,393 Hz | +1.6 dB | 6.00 |
| Peak | 37 Hz | -0.2 dB | 2.04 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons