BLON BL03 Review: Beyond the Hype – In-Ear Fidelity (2023)


For those interested in non-audio opinions, please refer to theunboxing post.

I don’t even know where to start with BLON, but it seems that they are now a company that needs no introduction. So let’s keep this section short and sweet.

The BL-03 is their newest golden goose, often compared to established models like the Moondrop KXXS or the Tanchjim Oxygen despite its price. There are rumours that this was tuned by the same guy who tuned the Oxygen, but nothing has been officially confirmed.

I’ll take this opportunity to clown on BLON’s name, which stands for: “Belief,Letmusicburn,Oppoty,Nevergiveup”.

Oh China. Never change.

Product page:


The BL03 was kindly provided by Linsoul.

(Video) Great Budget In Ear Headphones! - Blon BL 03



More info on the “Starsà la Cenric” award system

So now, I’ll address the giant white elephant that I released into the room. To anyone who already bought or own a BL03, this review isn’t for you. I’m not here to preach to the choir, neither am I here to “destroy the hype”. My job as a critic is to evaluate a product beyond the lens of popular opinion, beyond the expectations that people may have already set on my behalf, and so provide a fair and balanced analysis based on my own expertise and experience.

If this article agrees with your impressions, power to you. If it doesn’t, that’s fine too! I just hope that people can respect differing opinions without attacking each other.

My only request is for people on both sides of the fence to simply… read on. I may confirm some of your beliefs, while simultaneously disagreeing with others. As I’ve preached many times over and over, I’m just one guy on the internet and I should not be your only source of impressions and/or criticisms.

Some additional details:

(Video) BLON - BL03 - review

  • I received three different BL03 samples, all from different batches (according to Linsoul).
  • None of these samples have the linear 400Hz-1kHz response that other measured units seem to have.
    • The unit variance of my own three samples is a concern, but still expected for an IEM that retails for $30 on the street.
    • You may receive an “ideal sample” with the aforementioned linear response, or receive a unit that’s similar to the three that I have. It’s all lottery and I cannot guarantee anything.
  • I removed the memory wrapping around the stock cable to improve fit. The BL03s stay in my ears properly now.
  • Stock tips fit fine for me and so this review is all based on the sound on stock tips.
    • This is done intentionally so as not to alienate anybody who may not have aftermarket tips lying around. The BL03 will most likely be the many newbies’ first IEM purchase due to its price point and so this is (IMO) a valid assumption for most BL03 owners.
    • The additional costs of aftermarket tips and cable may also strip the BL03 of its “★★ value” after it is factored into the total price of the resulting setup.
  • This review is based on first, original sample sent to me. It is labelled “sample 1” on the database.

The subjective


I can see the BL03 being described in different ways. Neutral with bass boost, perhaps mildly V-shaped if one is sensitive to treble, but in my books I’d classify it as simply “warm”.

There is a wide-band lower frequency boost that encompasses almost the entire region of 20Hz to 1kHz which makes the BL03 generally bass boosted rather than any focus in sub-bass or midbass frequencies. The mids are in-line with the treble to my ears, with it being neither at the forefront nor the background of the overall mix. The treble is inoffensive yet decently energetic, with enough extension to not feel lacking.

The Bad

Alright, ready your pitchforks.

The BL03 doesn’t sound like a particularly technical or detailed IEM to me. The attack is a little blunted, the decay is extended just atad too long for my liking and the notes demonstrates hints of smearing into one another, though not to the extent where I would call it “muddy”. It’s pretty standard technicalities as far as a cheap, budget IEM is concerned, so I would not personally recommend anybody getting the BL03 if they prioritise sheer clarity and detailing in their music presentation.

(Video) Blon BL03 earphones review

The bass presentation is a little bloated to my ears, with percussive hits ringing a little too long and so bleeding slightly into the midrange. It is to be noted that I have definitely heard far, far worse from more expensive IEMs, so this isn’t me stating that the BL03 is a bloated mess, but rather that this is a concern that potential buyers should at least consider before making a purchase. Many are satisfied with this kind of bass, but my personal standards are rather high so YMMV, sound is subjective and all that.

Imaging is a metric that I usually don’t talk about because a vast majority of IEMs are average to me in this regard, but I will just touch on briefly. The instrumental positioning and soundstage size of the BL03 is nothing special to me. It’s not an absolute con by itself considering again, very few IEMs actually get my thumbs-up in these qualities.

The Good

If there’s one thing that the BL03 truly excels at, it’s in its tonality.

I don’t think I’ve encounteredanyone who will outright state that the BL03 sounds “wrong”, and I think that’s why it’s been such a popular IEM as of late. It is tuned very well, and while the dynamic driver inside it isn’t the most capable, I think the sound engineers did the best that they could with the cards they were dealt with.

The BL03 kind of has everything that makes it pleasing to a vast majority of ears out there: enhanced bass response, thicker-than-neutral notes, proper midrange tone, and treble that is neither too sharp nor too dark. I wouldn’t call it an exact Goldilocks situation, but it comes reasonably close. The BL03 is an IEM that justroughly fits into most people’s general preference, even if it may not be a perfect fit.

The Rank Justification

Now I know there has been… high expectations for my opinion on the BL03. It certainly has not made writing this review any easier, especially when I’ve been seeing people so confidently predicting that I’d rank these in the B ranks or even up in A!

So where I’d just drop the rank and run in my other reviews, I’ll switch it up a little with this one and sort of put into writing my thought process. Just looking at the more notable IEMs that I’ve rated at B- (excluding the MH755 for outlier reasons), we have the following:

  • ikko OH1 (OH10 as well)
  • Tin HiFi T4
  • VSonic GR07

All of which are many times more expensive than the BL03, but when in direct A-B comparison in the complete absence of price-to-performance value, Ipersonallydid not find the BL03 matching up to their levels of technical performance.

Now I will note one thing: I actually preferred the midrange tone of the BL03 to all of the above. The T4 and OH1/OH10 were a tad too shouty in the upper midrange for me, while the GR07’s treble response left something to be desired. The BL03 balanced upper-end energy without being overly-forward, and the “safeness” of its tuning is therefore its greatest strength.

But is its tonal balance enough for me to overlook its shortcomings in technical performance? I’d argue no to that. But on that note: is its tonal performance enough to distinguish itself from being simply “average”? Certainly.

(Video) Blon BL-03 In Ear Headphone Review

Even as a C+ IEM the BL03 can still thrive extremely well, being one of the few handfuls of sub-$50 IEMs that I would recommend when asked. Its immediate competition is really only the following:

  • The Tin HiFi T2, an IEM with a completely different signature (neutral) and is still more expensive than the BL03 at its cheapest
  • The CCA C10, arguably the biggest threat value-wise due to its lower street price
  • The Zero Audio Carbo Tenore, which is rather hard to find these days and comes with worse build quality compared to the BL03 (such as the lack of detachable cables, for instance)
  • The Final Audio E1000/E2000, which has the same problems as the Carbo Tenore but with evenworse QC issues than the BL03, and so hardly gets my personal recommendation

In that regard, the BL03 is still one of the most value-for-money IEMs out there, even if it may not be the ultimate market shaker that everyone seemingly wants it to be.


At an MSRP of $39 and a “street price” of $30, the value of the BL03 as an audiophile-oriented budget IEM is something we can all agree on, whether you’re someone who believes that the BL03 deserves a far higher rating or somebody who thinks that the BL03 is far too overhyped.

While I may not feel that the BL03 is a giant killer by any means, it certainly redefines what we should expect when we put down $30 for an IEM. Future budget IEMs have a high bar to clear.

Support me onPatreonto get access to tentative ranks!My usual thanks to all my current supporters and shoutouts to my big money boys:

(Video) BLON BL-03 Review: $30 Earbuds, Should we believe the hype?



BLON BL03 Review: Beyond the Hype – In-Ear Fidelity? ›

The BL03 kind of has everything that makes it pleasing to a vast majority of ears out there: enhanced bass response, thicker-than-neutral notes, proper midrange tone, and treble that is neither too sharp nor too dark. I wouldn't call it an exact Goldilocks situation, but it comes reasonably close.

Are the Blon bl03 good? ›

The build quality is rather good for the price range.

The BLON BL-03 is definitely not perfect, but it is built well enough to appear reasonably durable and resistant to a bit of abuse. The fact that the shell is made of just two pieces of metal also makes it more resistant than more complicated shells.

Is Blon bl03 good for gaming? ›

The upper-mids and highs are relaxed. There's not a lot of sparkle here, so some of the high end details fade away, but it helps the headphones to stay non-fatiguing. This tuning also makes them a decent fit for gaming.


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