:
-Bass with punch.
-Clear and detailed midrange.
-Smooth and non-fatiguing treble.
-Excellent comfort thanks to its ergonomic design.
-Unbeatable value for money.
:
-Some low-mid bleed in dense tracks.
-Soundstage is not the deepest.
-Cable could be more premium.
-Requires a decent source to shine at its best.
CCZ Harmony BC01 Pro Review:
Hello Community!
Today I bring an analysis of an IEM that hasn’t really generated much buzz in the affordable price range, perhaps because it hasn’t received much publicity: CCZ Harmony BC01 Pro, released this year 2025, and which stand out for their focus on everyday enjoyment without big pretensions, yet offering some very interesting ideas.
Introduction:
The CCZ Harmony BC01 Pro are a fresh proposal in the budget IEM market, focused on a fun and accessible sound. I didn’t know much about the brand before, but after reading mixed opinions, I decided to try them. I was expecting something basic, but they have surprised me with their balance and versatility. Although they don’t aim to be analytical, you can still extract very technical details during listening.
For me, sound goes beyond that: it’s about the emotion it conveys, and truly, when something costs so little and sounds good, it makes you enjoy it even more.
Will they live up to expectations? Let’s find out.
First, let’s take a look at the package contents:
-A typical little box for its price range.
-User manual.
-A cable terminated in 3.5mm, made of oxygen-free braided copper and coated in thin plastic.
-A set of ear tips in SML sizes.
-Two shells made of resin and plastic that let you see the internal driver configuration. Two-pin TFZ connection.
Comfort?
Definitely yes.
The shells are small and ergonomic, with a narrow nozzle diameter that allows a perfect fit without pressure. They weigh nothing and stay in place for hours, ideal for walks or long sessions.
However, the cable is really poor quality and feels fragile. A slap on the wrist for CCZ, since some of their competitors in the same price range ($15) offer better materials.
Even so, it didn’t snag on my clothes, and I didn’t have tangling or fit issues with the preformed ear hooks. I could live with it, but I’m not sure I can guarantee it would withstand daily or moderately intensive use.
As for the ear tips, I can’t say they’re bad, but they’re not good either. They do their job by sealing firmly and with just enough flexibility to avoid hurting your ear—and that’s something to appreciate at this price.
Technical aspects:
-Hybrid with 1 Dynamic Driver (1DD) of 10mm and 1 Balanced Armature (1BA).
-Impedance of 16 ohms.
-Sensitivity of 105 dB.
-Frequency range from 20hz to 20khz.
Pairing:
These IEMs are easy to drive with any source, but they shine with a neutral dongle DAC, gaining in resolution and control. They don’t need much amplification, but a clean source prevents the bass from getting out of control and gives more clarity to the upper region.
Sound signature:
The Harmony BC01 Pro offer a mild V-shaped signature, with emphasis on sub-bass and controlled treble, keeping the mids present for a fun and versatile sound.
♪Sub-bass: deep and well-extended, providing rumble without exaggeration, with texture that gives ambience to tracks without distortion.
♪Bass: punchy and fast, with firm impact that adds warmth, yet controlled so as not to invade other frequencies.
♬Lower mids: defined, although there’s slight bass bleed that can make them a bit thick in dense mixes, sacrificing some presence in low instruments.
♬Mids: clear and balanced, with good separation that makes voices and instruments sound natural and coherent, without being too recessed.
♬Upper mids: energetic but not aggressive, detail and air are easily distinguished, standing out in percussion and guitars.
Treble: smooth and airy, with decent extension that avoids harsh peaks, offering micro-detail without fatigue.
Very deep male voices: have body thanks to the bass, but are somewhat recessed in complex mixes, maintaining naturalness.
Normal male voices: full and well-positioned, with definition that makes them enjoyable, and satisfactory depth and articulation.
Female voices: detailed and articulated, emerging with clarity and natural timbre.
The soundstage is wide laterally, with good openness and coherence, but depth and height are average. Despite this, I didn’t notice a boxed-in feeling.
Imaging is sufficiently precise, allowing accurate placement of elements, reaching a level above what’s expected in its segment.
Layering handles complexity well, separating layers satisfactorily. In denser or chaotic environments, it fades slightly. It doesn’t become an incoherent sound mass, but I miss better work from its Balanced Armature driver.
Detail retrieval is solid, capturing subtleties with relative ease so they don’t get lost in the density of tracks.
How’s the performance in single-player games?
I encourage you to check the conditions under which I review headphones, always seeking the best cinematic experience possible, as well as the soundscapes of video games, in the following link to my blog
The source used was FiiO K11, filter no.5, and gain on medium.
★In the test of soundstage and depth distance of male voices in Red Dead Redemption 2, the immersion is satisfactory, with enough lateral spread, but distant voices feel somewhat centered, not showing all the expected depth, though with natural timbre.
★In Mafia The Old Country, the positioning of sound elements correctly represents gunshots and explosions both near and far, with enough clarity for an immersive experience. Enemy footsteps were perceived with good accuracy.
★In the dialogue test in A Plague Tale Requiem, female and child voices sound detailed and natural, with the expected timbre, while the teenage voice has a body not entirely thick but without losing resolution.
★In God of War Ragnarok, the rumble is strong yet controlled, with enough extension to add excitement to action moments. Reverb positioning is precise and well spaced, but lacks the extension needed to amaze, while Kratos’s voice is deep and articulated, without artificial masking, with solid and clear presence.
★In the immersion test through ambient micro-detail in Resident Evil 7, it correctly captures footsteps on wood, rain outside is faithfully represented, and environmental sounds like bugs and distant screams were properly rendered in presence and detail.
★In the extreme sibilance test in Final Fantasy XVI, it handles brightness without sting, maintaining proper separation though not with all the detail I could expect, yet I can affirm that, for its price range, it holds up well.
Final conclusions:
The CCZ Harmony BC01 Pro are a gem in their price range, ideal for those seeking fun without complications. Their punchy bass and clear mids make them versatile for rock, pop, instrumentals, or electronic music, with voices that stand out for their naturalness and for managing, in a way and within their limitations, to aim at being technical rather than simply pleasing the mass market. Being bold is something to praise.
In games, they offer convincing immersion, well-resolved dialogue, and action that—while not overwhelming—keeps you in tune with the context; and although they don’t shine in 3D soundstage, you won’t feel boxed in.
If you prioritize comfort and value, they’re a clear recommendation. They’re not perfect for purists, but they exceed expectations because they don’t fail in any aspect they were tested on.
I consider them a budget option well worth considering and perfectly valid for any type of single-player video game and practically any musical genre.
If you’ve made it this far, thanks for reading.
You can read my other reviews on my blog or here.
See you in the next review.
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Disclaimer:
This set of monitors was provided by @KEEPHIFI . I sincerely thank them for the opportunity to test one of their products free of charge, with no conditions imposed for writing this review.
Despite this, my priority is to be as impartial as possible within the subjectivity that comes with analyzing an audio product. My opinion is mine alone and is based on the perception of my own ears. If yours differs, it’s just as valid. Please feel free to share it.
My sources:
-FiiO K11 for video games on the main PC.
-FiiO KA13 while working.
-FiiO BTA30 Pro + FiiO BTR13 for wireless LDAC listening at home.
-FiiO BTR13 + iPhone 16 Pro Max for wireless listening outdoors.
-FiiO KA11.
-FiiO JA11.
-Macbook Air M4 3.5mm output.
-Shanling M0 Pro.
-iPod Classic 5.5 gen.
-iPod Shuffle 4 gen.
-Amazon Music Ultimate.
-Local FLAC and MP3 files.
