The Hidizs ST2 Pro ranks #1111 out of 1398 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Hidizs
Prices on this page were last checked October 19, 2026 at 10:32 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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#1111 Hidizs ST2 Pro: $69.99 Amazon $69.99 eBay
Pros: A single dynamic driver earphone on a USB-C cable with a built-in ESS DAC supporting 32 bit, 384 kHz and DSD128, so it plugs straight into a phone or laptop. Bass sits about 3.7 dB above target for a full low end and the midrange stays close to target.
Cons: An 11 dB peak near 8.2 kHz and a 6.5 dB peak near 10 kHz make the treble bright and can sound harsh, and upper bass nearly 6 dB above target thickens the sound. Deviation is high at 3 dB, and the Truthear Zero Blue 2 scores much higher at a similar price.
Is the Hidizs ST2 Pro right for you?
Buy it if
- you like extra bass (about +3 dB below 150 Hz versus the target).
- you want sub-bass rumble that reaches down to 20 Hz.
- you are happy to use EQ: our preset lifts its Harman match by about 22 points.
Skip it if
- you are treble-sensitive (treble sits about 2.3 dB above target).
- you want the best value: the higher-rated EPZ G10 costs about $46 less.
| Released | Dec 2024 (1 year ago) |
|---|---|
| Back | Closed |
| Connection | Wired (USB-C DAC cable) |
| Deviation From Target | 3.03 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dual magnetic circuit dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 61 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 108 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) |
| Tonal Tilt | -0.37 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -0.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 83 out of 100, up from 61.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -2.1 dB | 0.70 |
| High shelf | 10,000 Hz | -3.3 dB | 0.70 |
| Peak | 23 Hz | +2.7 dB | 1.66 |
| Peak | 179 Hz | -7.3 dB | 0.69 |
| Peak | 7,653 Hz | -5.9 dB | 6.00 |
Neutral target
Set a preamp of -0.1 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 83 out of 100, up from 30.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.6 dB | 0.70 |
| High shelf | 10,000 Hz | -3.3 dB | 0.70 |
| Peak | 174 Hz | -7.1 dB | 0.64 |
| Peak | 7,653 Hz | -5.9 dB | 6.00 |
Studio flat target
Set a preamp of -3.6 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 87 out of 100, up from 12.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -11.9 dB | 0.70 |
| High shelf | 10,000 Hz | +1.7 dB | 0.70 |
| Peak | 181 Hz | -9.3 dB | 0.73 |
| Peak | 2,514 Hz | +3.7 dB | 2.05 |
| Peak | 4,762 Hz | -2.9 dB | 5.30 |
| Peak | 7,895 Hz | -6.2 dB | 3.31 |
Warm target
Set a preamp of -0.1 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 84 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.8 dB | 0.70 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 176 Hz | -7.0 dB | 0.70 |
| Peak | 8,000 Hz | -7.4 dB | 1.87 |
Bass target
Set a preamp of -4.3 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 84 out of 100, up from 60.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.7 dB | 0.70 |
| High shelf | 10,000 Hz | -3.3 dB | 0.70 |
| Peak | 23 Hz | +2.8 dB | 1.56 |
| Peak | 182 Hz | -7.3 dB | 0.71 |
| Peak | 7,653 Hz | -5.9 dB | 6.00 |
Bright target
Set a preamp of -1.7 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 87 out of 100, up from 23.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.6 dB | 0.70 |
| High shelf | 10,000 Hz | +0.6 dB | 0.70 |
| Peak | 23 Hz | +2.2 dB | 2.20 |
| Peak | 76 Hz | -1.0 dB | 2.24 |
| Peak | 174 Hz | -7.2 dB | 0.64 |
| Peak | 797 Hz | +1.5 dB | 2.94 |
| Peak | 5,345 Hz | +1.7 dB | 0.40 |
| Peak | 7,834 Hz | -4.5 dB | 6.00 |
V-shaped target
Set a preamp of -5.0 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by Speaker Ranking from the median of 7 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 88 out of 100, up from 65.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.4 dB | 0.70 |
| High shelf | 10,000 Hz | +1.8 dB | 0.70 |
| Peak | 23 Hz | +2.7 dB | 1.69 |
| Peak | 80 Hz | -0.9 dB | 2.38 |
| Peak | 175 Hz | -5.9 dB | 0.70 |
| Peak | 5,345 Hz | +2.4 dB | 0.45 |
| Peak | 7,859 Hz | -4.1 dB | 6.00 |
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Frequency Response
How the Hidizs ST2 Pro measures across the audible range, against the Harman in-ear target that most listeners prefer in blind tests. Where the line sits above the target that range sounds louder (more bass, brighter treble), below it quieter. The curve is the median of 7 independent measurements, so one odd sample or rig cannot skew it, and both lines are shifted so their 500 Hz to 2 kHz average sits at 0 dB.
Measurement data: median of 7 measurements from the squig.link databases of aftersound, audioamigo, cqtek, hobbytalk, soundignity, tdl and vortexreviews. Thanks to each of them for publishing their work.