Short answer: the Whizzer HE01. It ranks #361 of 450 in-ear headphones by sound quality, rated 3.4/5, at $45; the KZ ZSX ranks #371, rated 3.3/5, and costs $49.99, which makes this an easy call rather than a real tradeoff.
The case for the Whizzer HE01: Bass, low mids and upper mids sit within about 1 dB of target, giving a warm, full-bodied sound that suits warm and bassy listeners. The catch: Hobbyist measurements on squig.link show an 8 dB dip near 6.4 kHz and treble about 4 dB under target, which dulls cymbals and detail, and sub-bass falls about 3 dB short.
What the KZ ZSX does well: A one dynamic plus five balanced armature hybrid at a budget price, with sub-bass within 1 dB of target and midbass about 2.4 dB above it, so electronic and hip hop tracks get punchy, full lows. The tradeoff: Across eight hobbyist measurements on squig.link a 10 dB peak near 11.9 kHz stands out, which can make cymbals and hi hats sound splashy and tizzy, while a 6.8 dB dip near 6.5 kHz leaves the treble uneven.
Buy the Whizzer HE01. It is rated higher for sound quality than the KZ ZSX and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| Whizzer HE01 | KZ ZSX | |
|---|---|---|
| Price | $45.00 | $49.99 |
| Ranked | #361 of 450 in In-Ear Headphones | #371 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 66 (measured by crinacle, via AutoEQ) | 65 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.78 dB standard deviation | 2.73 dB standard deviation |
| Tonal Tilt | -0.49 (negative is warmer, positive brighter) | -0.63 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 5 balanced armature) |
| Impedance | 18 ohms | 24 ohms |
| Sensitivity | 112 dB/mW | 111 dB |
| Frequency Response | 15Hz - 40kHz (Manufacturer specified) | 7Hz - 40kHz (Manufacturer specified) |
| Built-in Microphone | No | - |
| Back | Closed | Closed |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.9 dB at 30 Hz) |
| Drivers | - | 1 x dynamic + 5 x balanced armature |
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- KZ ZS10 Pro vs KZ ZSX
- KZ ZS10 Pro 2 vs KZ ZSX
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
Whizzer HE01: $45.00 Amazon eBay
Pros: Bass, low mids and upper mids sit within about 1 dB of target, giving a warm, full-bodied sound that suits warm and bassy listeners. A preference score of 66 is respectable for an inexpensive single dynamic driver. At 18 ohms and 112 dB/mW it plays loud from any phone.
Cons: Hobbyist measurements on squig.link show an 8 dB dip near 6.4 kHz and treble about 4 dB under target, which dulls cymbals and detail, and sub-bass falls about 3 dB short. The CCA C10 and KZ ZS10 Pro both carry higher ratings for slightly less money.
Full Whizzer HE01 review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.78 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | In-ear |
| Frequency Response | 15Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 66 (measured by crinacle, via AutoEQ) |
| Impedance | 18 ohms |
| Sensitivity | 112 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.8 dB at 30 Hz) |
| Tonal Tilt | -0.49 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.8 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 | +1.4 dB | 0.70 |
| Peak | 5,768 Hz | +6.2 dB | 1.56 |
| Peak | 147 Hz | -4.0 dB | 0.85 |
| Peak | 4,048 Hz | -4.4 dB | 1.31 |
| Peak | 8,692 Hz | +3.8 dB | 1.09 |
| High shelf | 10,000 Hz | -3.5 dB | 0.70 |
| Peak | 855 Hz | +3.1 dB | 1.21 |
| Peak | 1,897 Hz | -1.5 dB | 1.05 |
| Peak | 277 Hz | -0.9 dB | 1.84 |
| Peak | 3,401 Hz | +1.1 dB | 3.63 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KZ ZSX: $49.99 Linsoul eBay
Pros: A one dynamic plus five balanced armature hybrid at a budget price, with sub-bass within 1 dB of target and midbass about 2.4 dB above it, so electronic and hip hop tracks get punchy, full lows. Its 24 ohm, 111 dB rating means it plays loud straight from a phone, and it rates higher than the pricier BGVP DN3.
Cons: Across eight hobbyist measurements on squig.link a 10 dB peak near 11.9 kHz stands out, which can make cymbals and hi hats sound splashy and tizzy, while a 6.8 dB dip near 6.5 kHz leaves the treble uneven. The KZ ZS10 Pro from the same maker rates noticeably higher for slightly less money.
Full KZ ZSX review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.73 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 5 balanced armature) |
| Drivers | 1 x dynamic + 5 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 7Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 65 (measured by crinacle, via AutoEQ) |
| Impedance | 24 ohms |
| Sensitivity | 111 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.9 dB at 30 Hz) |
| Tonal Tilt | -0.63 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.6 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 | +0.6 dB | 0.70 |
| Peak | 162 Hz | -3.8 dB | 0.64 |
| Peak | 7,279 Hz | +5.8 dB | 1.94 |
| Peak | 732 Hz | +2.9 dB | 1.14 |
| Peak | 2,111 Hz | -4.3 dB | 2.80 |
| High shelf | 10,000 Hz | -5.5 dB | 0.70 |
| Peak | 9,793 Hz | +3.2 dB | 2.14 |
| Peak | 3,249 Hz | +3.3 dB | 4.13 |
| Peak | 5,021 Hz | -2.2 dB | 6.00 |
| Peak | 2,553 Hz | -1.2 dB | 2.76 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons