The BLON BL-A8 Prometheus ranks #1117 out of 1398 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: BLON
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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#1117 BLON BL-A8 Prometheus: $84.99 Discontinued eBay
Pros: A single dynamic driver earphone with bass about 2.8 dB above target and a midrange close to target, giving a warm sound, and 115 dB/mW sensitivity makes it loud from any phone.
Cons: Upper bass sits about 5 dB above target, which thickens the sound, presence is about 3 dB low with a dip near 4 kHz, and a 6.7 dB dip near 10.9 kHz removes air. It is discontinued.
Is the BLON BL-A8 Prometheus right for you?
Buy it if
- 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 31 points.
Skip it if
- you want to buy it new: it is discontinued.
| Released | 2021 (5 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.85 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 61 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 115 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) |
EQ Presets
Harman 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Harman match with this EQ: 92 out of 100, up from 61.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.2 dB | 0.70 |
| High shelf | 10,000 Hz | -0.3 dB | 0.70 |
| Peak | 23 Hz | +2.1 dB | 1.61 |
| Peak | 174 Hz | -6.4 dB | 0.74 |
| Peak | 820 Hz | +1.9 dB | 2.77 |
| Peak | 1,939 Hz | -1.8 dB | 3.39 |
| Peak | 3,020 Hz | +1.5 dB | 6.00 |
| Peak | 3,757 Hz | +6.0 dB | 2.91 |
| Peak | 4,524 Hz | +1.3 dB | 6.00 |
| Peak | 5,871 Hz | -2.8 dB | 6.00 |
Neutral 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 Neutral match with this EQ: 92 out of 100, up from 28.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -9.8 dB | 0.70 |
| High shelf | 10,000 Hz | -0.3 dB | 0.70 |
| Peak | 167 Hz | -6.3 dB | 0.69 |
| Peak | 816 Hz | +1.9 dB | 2.70 |
| Peak | 1,939 Hz | -1.8 dB | 3.40 |
| Peak | 3,020 Hz | +1.5 dB | 6.00 |
| Peak | 3,756 Hz | +6.0 dB | 2.90 |
| Peak | 5,870 Hz | -2.7 dB | 6.00 |
Studio flat 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Studio flat match with this EQ: 92 out of 100, up from 8.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -11.9 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 174 Hz | -8.3 dB | 0.74 |
| Peak | 342 Hz | -1.1 dB | 2.84 |
| Peak | 837 Hz | +1.8 dB | 2.65 |
| Peak | 1,796 Hz | -1.1 dB | 4.01 |
| Peak | 3,316 Hz | +6.0 dB | 2.28 |
| Peak | 4,134 Hz | +2.3 dB | 5.87 |
| Peak | 5,845 Hz | -4.7 dB | 6.00 |
Warm target
Set a preamp of -4.1 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Warm match with this EQ: 93 out of 100, up from 69.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -1.0 dB | 0.70 |
| High shelf | 10,000 Hz | -3.7 dB | 0.70 |
| Peak | 23 Hz | +2.1 dB | 1.61 |
| Peak | 172 Hz | -6.2 dB | 0.76 |
| Peak | 829 Hz | +2.1 dB | 2.29 |
| Peak | 2,016 Hz | -2.4 dB | 3.65 |
| Peak | 3,100 Hz | +1.4 dB | 6.00 |
| Peak | 3,790 Hz | +4.3 dB | 3.64 |
| Peak | 6,059 Hz | -4.4 dB | 5.30 |
| Peak | 7,829 Hz | -2.3 dB | 3.65 |
Bass 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bass match with this EQ: 93 out of 100, up from 66.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +2.6 dB | 0.70 |
| High shelf | 10,000 Hz | -0.3 dB | 0.70 |
| Peak | 23 Hz | +2.2 dB | 1.48 |
| Peak | 176 Hz | -6.4 dB | 0.76 |
| Peak | 821 Hz | +1.8 dB | 2.81 |
| Peak | 1,939 Hz | -1.8 dB | 3.39 |
| Peak | 3,021 Hz | +1.5 dB | 6.00 |
| Peak | 3,757 Hz | +6.0 dB | 2.91 |
| Peak | 4,524 Hz | +1.3 dB | 6.00 |
| Peak | 5,871 Hz | -2.8 dB | 6.00 |
Bright target
Set a preamp of -6.4 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 3 squig.link measurements, in the filter layout AutoEQ uses. Predicted Bright match with this EQ: 89 out of 100, up from 17.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -9.8 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 23 Hz | +1.7 dB | 1.96 |
| Peak | 168 Hz | -6.3 dB | 0.66 |
| Peak | 815 Hz | +1.8 dB | 2.44 |
| Peak | 1,978 Hz | -2.0 dB | 4.05 |
| Peak | 3,196 Hz | +1.9 dB | 4.89 |
| Peak | 3,987 Hz | +6.0 dB | 1.71 |
V-shaped target
Set a preamp of -6.5 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 V-shaped match with this EQ: 86 out of 100, up from 60.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +3.2 dB | 0.70 |
| High shelf | 10,000 Hz | +2.0 dB | 0.70 |
| Peak | 23 Hz | +2.2 dB | 1.53 |
| Peak | 172 Hz | -5.0 dB | 0.75 |
| Peak | 777 Hz | +1.3 dB | 2.56 |
| Peak | 1,939 Hz | -1.9 dB | 3.10 |
| Peak | 3,100 Hz | +1.4 dB | 6.00 |
| Peak | 3,807 Hz | +6.0 dB | 1.51 |
| Peak | 4,786 Hz | +2.0 dB | 5.59 |
- Reviews, Comparisons and Sound Samples
Frequency Response
How the BLON BL-A8 Prometheus 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 harpo, hbb and vortexreviews. Thanks to each of them for publishing their work.