• Jan 22, 2026
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Blon x HBB Z300 10mm Silicone Diaphragm DD IEM Reviews

Reviewed by awacs7n

Pros

- first class build,
- the z 300 comes with one of the best cables in the budget segment,
- nice look,
- safe medium frequencies
- for bass lovers

Cons

- iems are pretty heavy,
- in fast music fuzzy bass response,
- a little muddy
- short nozzle (my problem, may not be a problem for everyone)
- too much bass for some

I wrote that I would give 3.5 / 5 points for the z 300 in the thread, but I decided to give it 4 / 5. The reason is probably that the burning times of the silicone diaphragm can be a little longer. After listening more, the bass got a little more textured, yet the fuzzy bass response remains.
putting an unexpectedly good cable in the box caused me to change my mind a bit.

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blon is a well-known brand from a few years ago. The bl 03 model was one of the best budget models for that period. Oddly enough, blon couldn't find any success after bl 05. The success of the bl 05 is also debatable, as a result it did not sell as much as a bl 03. Anyway, let's see if the z 300 can beat the success of bl 03.

I ordered the iems from yaoyaotiger in exchange for an honest review. I'm thinking of adding the store address at the end of the review. Thank you yaoyaotiger for the z 300.



box contents;



The box is a classic blon box, white, and the iems shipped with a small box. The cable that came out of the box surprised me, I'll talk about it in another chapter.

- a pair of iems
- a good cable
- 6 pairs of silicone tips
- user manual
- fabric storage case


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iems and cable quality;




first-class craftsmanship and good pattern. There are patterns on the iems, it is good in appearance. The z 300 has probably already entered the list of my favorite designs. I will touch on some things about the structure of the z 300 in the comfort section, now let's move on to the cable.
If you come to the cable part, the blon brand has deviated from its classical line and put a good cable in the box. normally blon cables are awful, maybe even worse than goose cables. The cable of the z 300 is good, especially for the budget segment. As a result, there is a cable and structure, which can be called a reference for the price, in the z 300.

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sound quality;



The z 300 focuses more on a fun sound character rather than a technical sound, which makes the z 300 more fun than some models, while losing it to some of its competitors in technical matters. To mention a little more, the z 300 is a bass boosted model. mid frequencies are safe, and trebles are lightly textured.



low frequencies;



The region of the z 300's most dominant frequencies, the basses are quite voluminous. The mid-bass is pretty good too. i have to say the silicon driver needs some burning, the bass bleeds a bit until i get enough listening times. Bass bleed lessens when you spend some time with the iems, and there is almost no bass bleed on most slow tracks. The z 300's bass isn't too tight, it's a little too long. If the music has too much bass, the bass response gets a little blurry and feels slightly muddy. nevertheless, the z 300 is a fun model with its bass.


medium frequencies;



A safe setting is preferred, there is a tune that is a little thicker than the average. You can't listen to stringed instruments as lively as the bl 03, but for the budget segment, there's not much to criticize here. The point to be noted is that if you like to listen to the mid frequencies, you need to turn up the volume a little more, which causes the low frequencies to overshadow the mid frequencies a little.


trebles;



They have slightly textured trebles, a good choice for a iems with increased low frequencies. maybe it could be a little more natural, like in bl 03. still, it is worth saying that it has more balanced trebles than most models in the similar segment.

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sound stage;



It is above average in width and not bad in height, but you feel a lack of depth. the sound sounds more superficial.



resolution;



If it was 2 years ago, I wouldn't have criticized it, but now we are in 2023. Technically successful models are now down to the 20 band. details are a bit blurry, which causes slight muddying in fast music.



comfort;



it's a bit of a personal issue, comfort, my understanding of comfort is different from other people and this means that the consistency of my comments on comfort will only be right for me. anyway, the z 300 is a heavy iems. it's not that big of a model, it's heavy. It fits surprisingly well, but I have to say the nozzles are a little short for my ears. If you don't mind the weight there is no problem, I
I can't listen for a long time.



comparisons;



comparisons may reflect my own musical taste


vs zhulinniao z 4;


bass;



z 4 - % 25
z 300 - % 75

You can see how weak the bass is on the z 4, if you like bass it's hard for the z 4 to compete with the z300



mids;



z 4 - % 55
z 300 - % 45

The reason why the z4 is a bit better is that the mid frequencies are smoother due to the depth of the scene. they are very similar but the mid frequencies of the z 4 are much more elegant



treble;



z 4 - % 60
z 300 - % 40

At least one of the models with the best treble among the dozens of models that I have experienced is the z 4. The treble of the z 4 is highly textured and it is possible to interfere with the treble level thanks to the replaceable filter. If you love highs, even a treble-heavy model like the ivipq can be beaten against the z 4, at least in the budget segment. Like most models, the z 300 is losing to the z 4 when it comes to treble.



sound stage;



z 4 - % 60
z 300 - % 40

While the z 300 has almost no soundstage depth, the z 4 is the opposite.



resolution;



z 4 - % 60
z 300 - % 40

In terms of resolution, the z 4 is above average and has very good treble resolution for its price band. The z 300 isn't bad either, but it gets muddy with fast music.



comfort;



z 4 - % 55
z 300 - % 45

The z 4 fits better, but is a bit heavier, though not as much as the z 300. However, there is a difference in comfort. Not to forget that the z 4 was brilliant, the z 300 was better in listening comfort



preference;



two different models, it depends entirely on preferences. If you like highs, the z 300 is very difficult to choose over the z 4, but most budget segments can easily beat the z 4 in bass. out of bass, the z 4 is a more successful model

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vs blon bl 03;


bass;



bl 03 - % 50
z 300 - % 50

I don't want to tire myself, almost equally, if I remember correctly, the bass of 03 is a little tighter. Z 300 has one click more voluminous bass



mids;



03 - % 55
z 300 - % 45

There's a slight difference, but the 03's timbre accuracy turns it into a midrange beast. It is a pleasure to listen to stringed musical instruments with the 03. z 300 is better as mid frequency resolution



trebles;



03 - % 55
z 300 - % 45

Even though the 03v is loud, its highs are quite soft and not tiresome. The z 300's treble might be a little more textured, but it lacks a bit of naturalness. If I'm sure I remember 03 correctly, I think 03 has slightly better treble.



sound stage;



03 - % 60
z 300 - % 40

The 03 has an in-depth soundstage and feels like it's out of your ears. Except for the feeling I mentioned, bl 03 is a bit better, I may not be neutral about it.



resolution;



bl 03 - % 40
z 300 - % 60

The 03 has pretty mediocre resolution, even lower than average. The z 300's macro details are much better



preference;



We are no longer living in 2020, it is difficult for any headset without a specific technique to compete in the 2023 market. moreover, you have to order the bl 03 with the cable, which means that the price of the 03 is the same as the z 300. I would still choose bl 03, but this is due to my sympathy for 03. in a standard comparison, the z 300 makes much more sense



last word;



the z 300 is not as successful as the bl 03, it is still a successful model. I was not very impressed with the sound character, but I was impressed by the appearance. If you're looking for a fun and well-built iems in the price range, the z 300 is a good choice. If you are looking for a more detailed model, I recommend you to evaluate different options.



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