The Apos Rock Lobster ranks #990 out of 1369 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Prices on this page were last checked October 17, 2026 at 6:04 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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#990 Apos Rock Lobster: 9.99 Apos eBay
Pros: A published AutoEQ preset corrects its response toward the Harman target, so a few minutes of EQ setup closes most of the gap.
Cons: Treble about 3 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones. An uneven response, 2.4 dB standard deviation from target.
Is the Apos Rock Lobster right for you?
Buy it if
- you are sensitive to bright or sharp treble (treble sits 2.7 dB below 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 24 points.
Skip it if
- you want the best value: the higher-rated KZ ZST X costs about $3 less.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.43 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm liquid crystal polymer (LCP) dynamic driver |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz |
| Harman Preference Score | 64 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 105 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.9 dB at 30 Hz) |
| Tonal Tilt | -1.01 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -5.4 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 88 out of 100, up from 64.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.7 dB | 0.70 |
| High shelf | 10,000 Hz | -0.5 dB | 0.70 |
| Peak | 179 Hz | -3.6 dB | 0.76 |
| Peak | 2,306 Hz | +1.6 dB | 3.33 |
| Peak | 5,370 Hz | +5.3 dB | 2.06 |
Neutral target
Set a preamp of -5.4 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 89 out of 100, up from 26.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.3 dB | 0.70 |
| High shelf | 10,000 Hz | -0.5 dB | 0.70 |
| Peak | 174 Hz | -3.4 dB | 0.65 |
| Peak | 713 Hz | +0.9 dB | 3.06 |
| Peak | 2,302 Hz | +1.6 dB | 3.24 |
| Peak | 5,369 Hz | +5.3 dB | 2.06 |
Studio flat 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 85 out of 100, up from 6.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -12.0 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 170 Hz | -5.4 dB | 0.69 |
| Peak | 1,346 Hz | -1.5 dB | 2.78 |
| Peak | 2,773 Hz | +3.3 dB | 0.77 |
| Peak | 3,721 Hz | -1.6 dB | 6.00 |
| Peak | 5,708 Hz | +2.9 dB | 4.46 |
Warm 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 90 out of 100, up from 76.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.5 dB | 0.70 |
| High shelf | 10,000 Hz | -3.8 dB | 0.70 |
| Peak | 175 Hz | -3.3 dB | 0.80 |
| Peak | 5,583 Hz | +3.8 dB | 3.49 |
Bass target
Set a preamp of -5.4 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 89 out of 100, up from 72.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.1 dB | 0.70 |
| High shelf | 10,000 Hz | -0.5 dB | 0.70 |
| Peak | 35 Hz | +0.8 dB | 1.69 |
| Peak | 186 Hz | -3.6 dB | 0.80 |
| Peak | 731 Hz | +0.8 dB | 3.78 |
| Peak | 2,307 Hz | +1.6 dB | 3.33 |
| Peak | 5,370 Hz | +5.3 dB | 2.07 |
Bright target
Set a preamp of -6.2 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 81 out of 100, up from 14.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -10.3 dB | 0.70 |
| High shelf | 10,000 Hz | +1.9 dB | 0.70 |
| Peak | 174 Hz | -3.5 dB | 0.63 |
| Peak | 4,947 Hz | +6.0 dB | 1.50 |
V-shaped target
Set a preamp of -6.0 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 6 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 78 out of 100, up from 60.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.7 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 186 Hz | -2.2 dB | 0.83 |
| Peak | 4,774 Hz | +5.9 dB | 1.26 |
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Frequency Response
How the Apos Rock Lobster 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 aden, audioamigo, awsmdanny, boizoff, jaytiss, lestat and tonedeafmonk. Thanks to each of them for publishing their work.