General Information

Brand: BLON
Model: BL-03
Earphone type: In-ear
Impedance: 32Ω
Earphone sensitivity: 102dB/mW
Frequency range: 20-20000Hz
Interface: 3.5mm
Plug Type: L-shaped
Cable Length: 1.2m±3cm
Colors: Silver, Gunmetal
Cable type: 2-Pin 0.78MM connector
Driver unit: 10mm Carbon Diaphragm Dynamic Driver

Latest reviews


New Head-Fier
Blon bl-03 Still worthy in 2023?
Pros: 1. Sound quality for the price
2. Build like a tank
3. Comfort (Subjective)
4. Versatile sound signature
Cons: 1. Cable on the flimsy side
2. Lack of tight bass impact (subjective)
3. Eartips
The BLON-03 in-ear monitors (IEMs) had quite a buzz in the audio community, and after spending some quality time with them, it's time to weigh in on the excitement. Let's dive in, shall we?


These tiny beasts pack a punch in the clarity department. The BLON-03's 8mm dynamic driver delivers a pristine listening experience. You can expect to hear every note crystal clear, making them perfect for audiophiles craving intricate details. The ergonomic design is like a snug, audio-hugging pillow for your ears. The fit is secure, even during long listening sessions, and they're incredibly lightweight, so you won't be doing the IEM shuffle.

For their price, the BLON-03 offer excellent value for money. You won't have to break the bank to enjoy high-quality sound. These IEMs are well-suited for a variety of music genres, thanks to a warmish sound signature. They can rock out with the best of them, but also lend themselves to mellower tracks.
But there is main con, The cable that comes with the BLON-03 could use an upgrade. It's a bit on the flimsy side, so you might want to invest in a sturdier option.
If you're a basshead looking for earth-shattering lows, these may not be your jam. The bass is present and accounted for but stays well-behaved.
In conclusion, the BLON-03 IEMs are a delightful surprise for the budget-conscious audiophile. With their clarity, comfort, and versatility, they punch above their weight. However, if you demand premium build quality and thunderous bass, you might want to look elsewhere like QKZ X HBB, 7Hz Legato or Ikko OH10. For those on the hunt for a sonic adventure without emptying your wallet, the BLON-03 are a solid choice. Happy listening!

Songs I used to test -

  1. "Tere Bina" (from the movie "Guru") by A. R. Rahman
  2. "Kandisa" by Indian Ocean
  3. "Tum Itna Jo Muskura Rahe Ho" by Jagjit Singh
  4. "Raabta" (Unplugged) by Arijit Singh
  5. "Teri Deewani" by Kailash Kher
  6. "Raga Jog" by Ravi Shankar
  7. "Breathless" by Shankar Mahadevan
  8. "Nayan Tarse" (from the movie "Dev D") by Amit Trivedi
  9. "Sun Saathiya" (from the movie "ABCD 2") by Shreya Ghoshal

This proves that you really don't have to sell a kidney to get some good sound....! damn good pair of IEM's.


New Head-Fier
Pros: Price
Decent soundstage
Very present Bass
Warm and natural mids
Vocals never get shouty
Build quality
Cons: Stock cable
Stock tips
At this point i guess i don't have to explain what's Blon, right?
"What's Blon?"
Dude, do you live under a rock?
Ok, i'll (try) to explain for you.
Blon is an chinese headphone brand that became very popular after release the Bl 03.
The Bl 03 are cheap iems that quickly became very popular in the audio comunity.
I gonna explain in this review, be patient.

Build quality and fit
The Blons are made in metal, so they feel pretty solid, but due the metal they are a bit heavy.
The conectors are an weird kind of 0.78 2 pins.
The fit is terrible.
The shells themselves are not the problem.
The main problem is the nozzles, that are too short, then the fit is pretty shallow and some people can't get an good seal.
Fortunately, this can be fixed with aftermark eartips, like spinfits.

As we're talking about eartips, lets talk about the stock eartips and cable.
It comes with 6 pairs of silicone tips.
The eartips are really bad, i can't get a decent seal with they, so i can't talk about how they sound, but the materials aren't good.

Feels very fragile and not well made.
Sadly (not at all) i've lost most part of the tips, so i can't show them.

The cable is also bad, but not due to the wires themselves, and due to the earhooks.
The earhooks are molded in a weird shape and with a stiff plastic that have a "spring" effect.

The cable itself isn't that bad, actually IMO is better than the old Kz brown cables, but it tangles a lot.

The sound

This is the reason of these little guys are so famous.
They have an warm sound signature, with focus on the bass.
The bass is strong but i would not call this a basshead iem.
It's on the relaxed side, so it sounds very organic and natural, with a good impact and decent texture.
Due to the more relaxed kind, the bass isn't the fastest, then for complexe tracks i would not recommend the Blons.

The mids are my favorite part about this iem.
They sound a bit veiled, but due to the naturality i can forgive it.
The mids are on the warmer side, vocals sound pretty smooth and never gets shouty.
Instruments sounds very correct and wont be agressive like some other cheap iems.

The treble is the worst part of the Blons.
They aren't bad, but at the sabe time aren't as good as the bass and mids.
It lacks air and sound a bit lifeless sometimes.

Soundstage and imaging
The soundstage is actually decent, but the imaging isn't the best.
You can distinguish if the sound comes from the left, right, back or front, but you can't pickpoint.

The details are fine, not bad but not amazing, just ok.

For the price, the Blons are good, they sound very natural and fun, but it can suffer in busy songs though.
If you don't listen to very complex tracks, it will be an decent option under 30$.
Sorry if my english sucks, english isn't my first language, i'm learning.
Last edited:
I have found that the tangle prone stock cable actually sounded better with these drivers than a few after markets. As long as you let the cable hang down and not around your ear it’s a symbiotic match.However, I can’t help you with the tangles. Once you get them to seal properly and feed them with a lot of power they are amazing and not just for the price. Very underrated in my opinion.


New Head-Fier
Great Enjoyable IEM for the Price
Pros: Good Bass and clarity
Cons: Soundstage and Fit
It is a good IEM and I like it. I have included the measurments I have done using the UMIK-1 and a 3D Printed adapter for measuring IEM's


  • BLON BL03.jpg
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New Head-Fier
Hi all,
I got them few days ago, and I am very impressed by the smooth sound it delivers.
Though, I seem to hear a kind of low bass rattling, I did not compared yet with other earphones, just wanted to know if anyone here experiences it. Maybe it is just the songs, or my pair, or me.. :)
Very pure and enjoyable sound reproduction anyway (cymbals in particular ❤️)