BLON BL-03 Review: Ranked #535 of 584

Last updated: October 13, 2026

The BLON BL-03 ranks #535 out of 584 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 12, 2026 at 4:13 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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BLON BL-03 - ranked #535 of 584 In-Ear Headphones · Editor's rating 2.6/5

#535 BLON BL-03 Discontinued eBay

Pros: A budget classic with full, warm bass about 4 dB above target and extension to 20 Hz, giving a fun, easy listening sound.

Cons: Discontinued, so it is mainly found used. Presence sits about 3.8 dB low with a 5.8 dB dip near 6.4 kHz, so it lacks some detail, and the shell shape is known for a tricky fit. Its Harman score of 57 trails modern budget IEMs.

Released2019 (7 years ago)
BackClosed
ConnectionWired
Deviation From Target3.00 dB standard deviation
Driver TypeDynamic
Drivers1 x 10mm dynamic (carbon diaphragm)
Form FactorIn-ear
Frequency Response20Hz - 20kHz (Manufacturer specified)
Harman Preference Score57 (measured by oratory1990, via AutoEQ)
Impedance32 ohms
Sensitivity102 dB/mW
Sub-bass ExtensionWithin 6 dB of target down to 20 Hz (+2.5 dB at 30 Hz)
Tonal Tilt-1.30 (negative is warmer, positive brighter)
EQ preset to match the Harman 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 AutoEQ from its measured frequency response.

FilterFrequencyGainQ
Low shelf105 Hz-3.1 dB0.70
Peak176 Hz-4.2 dB0.90
Peak3,339 Hz+4.9 dB2.96
Peak707 Hz+2.3 dB1.69
Peak6,364 Hz+5.2 dB3.64
High shelf10,000 Hz+2.6 dB0.70
Peak1,931 Hz-1.7 dB2.22
Peak2,724 Hz+1.2 dB4.73
Peak59 Hz+0.3 dB1.85
Peak981 Hz+0.5 dB3.20

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