The JBL Endurance RUN ranks #660 out of 1084 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: JBL
Prices on this page were last checked October 15, 2026 at 5:41 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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#660 JBL Endurance RUN Discontinued eBay
Pros: A sweatproof sport earphone with a fixed cable, inline remote and mic. Measurements show treble right on the Harman target and full sub-bass to 20 Hz (score 68 across three measurements).
Cons: Discontinued, so it is mainly found used. Bass sits about 3.5 dB above target, a bass heavy balance. Its score rests on three measurements.
Is the JBL Endurance RUN right for you?
Buy it if
- you like extra bass (about +4 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 24 points.
Skip it if
- you want to buy it new: it is discontinued.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.22 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 68 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| Tonal Tilt | -0.67 (negative is warmer, positive brighter) |
EQ Presets
Harman target
Set a preamp of -2.5 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 92 out of 100, up from 68.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -2.6 dB | 0.70 |
| High shelf | 10,000 Hz | -1.6 dB | 0.70 |
| Peak | 23 Hz | +1.6 dB | 1.45 |
| Peak | 173 Hz | -5.6 dB | 0.72 |
| Peak | 801 Hz | +1.4 dB | 2.23 |
| Peak | 2,441 Hz | -1.9 dB | 3.81 |
| Peak | 4,663 Hz | -3.2 dB | 5.71 |
| Peak | 6,121 Hz | +3.1 dB | 6.00 |
Neutral target
Set a preamp of -2.5 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Neutral match with this EQ: 92 out of 100, up from 31.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -11.1 dB | 0.70 |
| High shelf | 10,000 Hz | -1.6 dB | 0.70 |
| Peak | 164 Hz | -5.4 dB | 0.63 |
| Peak | 795 Hz | +1.5 dB | 2.13 |
| Peak | 2,443 Hz | -1.9 dB | 3.87 |
| Peak | 4,664 Hz | -3.2 dB | 5.73 |
| Peak | 6,121 Hz | +3.1 dB | 6.00 |
Studio flat target
Set a preamp of -2.0 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 90 out of 100, up from 12.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -12.0 dB | 0.70 |
| High shelf | 10,000 Hz | +1.2 dB | 0.70 |
| Peak | 170 Hz | -7.7 dB | 0.72 |
| Peak | 832 Hz | +1.4 dB | 2.09 |
| Peak | 3,021 Hz | +1.6 dB | 3.15 |
| Peak | 4,727 Hz | -4.0 dB | 6.00 |
| Peak | 6,170 Hz | +2.4 dB | 6.00 |
Warm target
Set a preamp of -1.3 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 92 out of 100, up from 74.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -2.4 dB | 0.70 |
| High shelf | 10,000 Hz | -4.2 dB | 0.70 |
| Peak | 23 Hz | +1.6 dB | 1.44 |
| Peak | 171 Hz | -5.4 dB | 0.74 |
| Peak | 801 Hz | +1.8 dB | 2.25 |
| Peak | 2,344 Hz | -1.6 dB | 3.66 |
| Peak | 4,148 Hz | -2.8 dB | 0.97 |
| Peak | 6,046 Hz | +2.7 dB | 6.00 |
| Peak | 8,000 Hz | -2.7 dB | 6.00 |
Bass target
Set a preamp of -2.8 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 93 out of 100, up from 75.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.2 dB | 0.70 |
| High shelf | 10,000 Hz | -1.6 dB | 0.70 |
| Peak | 23 Hz | +1.7 dB | 1.32 |
| Peak | 176 Hz | -5.6 dB | 0.74 |
| Peak | 802 Hz | +1.4 dB | 2.27 |
| Peak | 2,440 Hz | -1.9 dB | 3.79 |
| Peak | 4,662 Hz | -3.2 dB | 5.70 |
| Peak | 6,121 Hz | +3.1 dB | 6.00 |
Bright 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 Speaker Ranking from the median of 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 89 out of 100, up from 21.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -11.2 dB | 0.70 |
| High shelf | 10,000 Hz | +0.9 dB | 0.70 |
| Peak | 164 Hz | -5.5 dB | 0.64 |
| Peak | 5,851 Hz | +6.0 dB | 5.28 |
V-shaped target
Set a preamp of -5.9 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted V-shaped match with this EQ: 86 out of 100, up from 69.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.8 dB | 0.70 |
| High shelf | 10,000 Hz | +1.6 dB | 0.70 |
| Peak | 23 Hz | +1.7 dB | 1.41 |
| Peak | 168 Hz | -4.2 dB | 0.76 |
| Peak | 3,548 Hz | +2.1 dB | 5.76 |
| Peak | 5,782 Hz | +6.0 dB | 4.43 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the JBL Endurance RUN 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 3 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 3 measurements from the squig.link databases of eplv, hobbytalk and suporsalad. Thanks to each of them for publishing their work.