TRUTHEAR x Crinacle Zero:BLUE2
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Zero Blue: 2 - Introduction
Blue: 2 uses a 10mm Dynamic Driver and a 7.8mm Dynamic Driver, just like Blue 1 or Red. The faceplate of Blue 2 just like fish fin, pretty beautiful to me. The nozzle is also shorter than Red/Blue 1, which helps better fit.
The stock cable was alright, nothing too special and definitely a cable that I would expect to come with a budget cheap-fi IEM.
I tested with:
Tanchjim Luna, Chord Hugo2, AK SE180 SEM4, HiBy R6III 2025
Eartips: Pentaconn Coreir AL, Radius Deep Mount Japan version, stock eartips
Cables: stock cable, single crystal silver custom cable
Zero Blue: 2 - How does it sound?
The Blue 2 tuning is Neutral sound with bass boosted (following the Harman target), delivers a noticeably tighter and more pleasing bass compared to the Blue 1/Red. The subbass is quite deep, providing good rumble, while the midbass is thick and well controlled. Compared to the Blue 1, the bass on version 2 is also sounding less muddy than the first one. We can say that the bass on the Blue 2 has been better refined, though the overall sound across all frequencies still remains soundwhat muddy.
The midrange sounds quite natural. However, female vocals tend to be more recessed than male vocals, and the reproduction of instrumental sounds isn't good. For guitars, the notes often lack weight, and the same applies to piano, making these instruments feel undistinguished and leading to a boring listening experience over time. Additionally, the entire instrumental section feels pushed into the background, making the sound feel dark. Vocals, on the other hand, seem to hover somewhere between the background and foreground, so sometimes they can sound drowned, while other times they clearly stand out from the background. Speaking of timbre, the Blue 2's DD isn't natural at all, so the sound isn't entirely natural.
The treble not having any sibiliance is a plus, and details come through quite well, with instruments in the treble range sounding better than in the midrange. However, because it's a Harman-tuned treble, it might sound a bit boring or dark for those who prefer a brighter treble.
The soundstage is average, neither constrained nor expansive. The imaging is not totally precise, sometimes even getting muddled in certain tracks. Layering is weak, not clearly separating instruments. Across the entire frequency range, only the mids feel slightly unnatural in terms of timbre.
Zero Blue: 2 - Competitors
Tanchjim Bunny - The IEM that killed Blue: 2
If you love bass, then the Blue 2 might still be a decent choice. But what about the overall sound across all frequencies?
Compared to the Blue 2, the Bunny offers a much more balanced and significantly clearer sound profile, and it's also considerably cheaper than the Blue 2.
The technical performance and detail retrieval of the Bunny are on par with the Blue 2, while its overall tuning is distinctly superior. This makes the Blue 2 seem almost like a joke, given it sells for several times the price of the Bunny.
From vocals to instruments, from soundstage to imaging, everything on the Bunny is much better than the Blue 2. Vocals are clearer and more forward, and instruments have more impact and better separation.
In summary, if you're only listening for bass, you could consider the Blue 2. However, if you care about any other frequency ranges, you should never buy the Blue 2.
Summary
In short, Blue 2 is bad.
Blue: 2 uses a 10mm Dynamic Driver and a 7.8mm Dynamic Driver, just like Blue 1 or Red. The faceplate of Blue 2 just like fish fin, pretty beautiful to me. The nozzle is also shorter than Red/Blue 1, which helps better fit.
The stock cable was alright, nothing too special and definitely a cable that I would expect to come with a budget cheap-fi IEM.
I tested with:
Tanchjim Luna, Chord Hugo2, AK SE180 SEM4, HiBy R6III 2025
Eartips: Pentaconn Coreir AL, Radius Deep Mount Japan version, stock eartips
Cables: stock cable, single crystal silver custom cable
Zero Blue: 2 - How does it sound?
The Blue 2 tuning is Neutral sound with bass boosted (following the Harman target), delivers a noticeably tighter and more pleasing bass compared to the Blue 1/Red. The subbass is quite deep, providing good rumble, while the midbass is thick and well controlled. Compared to the Blue 1, the bass on version 2 is also sounding less muddy than the first one. We can say that the bass on the Blue 2 has been better refined, though the overall sound across all frequencies still remains soundwhat muddy.
The midrange sounds quite natural. However, female vocals tend to be more recessed than male vocals, and the reproduction of instrumental sounds isn't good. For guitars, the notes often lack weight, and the same applies to piano, making these instruments feel undistinguished and leading to a boring listening experience over time. Additionally, the entire instrumental section feels pushed into the background, making the sound feel dark. Vocals, on the other hand, seem to hover somewhere between the background and foreground, so sometimes they can sound drowned, while other times they clearly stand out from the background. Speaking of timbre, the Blue 2's DD isn't natural at all, so the sound isn't entirely natural.
The treble not having any sibiliance is a plus, and details come through quite well, with instruments in the treble range sounding better than in the midrange. However, because it's a Harman-tuned treble, it might sound a bit boring or dark for those who prefer a brighter treble.
The soundstage is average, neither constrained nor expansive. The imaging is not totally precise, sometimes even getting muddled in certain tracks. Layering is weak, not clearly separating instruments. Across the entire frequency range, only the mids feel slightly unnatural in terms of timbre.
Zero Blue: 2 - Competitors
Tanchjim Bunny - The IEM that killed Blue: 2
If you love bass, then the Blue 2 might still be a decent choice. But what about the overall sound across all frequencies?
Compared to the Blue 2, the Bunny offers a much more balanced and significantly clearer sound profile, and it's also considerably cheaper than the Blue 2.
The technical performance and detail retrieval of the Bunny are on par with the Blue 2, while its overall tuning is distinctly superior. This makes the Blue 2 seem almost like a joke, given it sells for several times the price of the Bunny.
From vocals to instruments, from soundstage to imaging, everything on the Bunny is much better than the Blue 2. Vocals are clearer and more forward, and instruments have more impact and better separation.
In summary, if you're only listening for bass, you could consider the Blue 2. However, if you care about any other frequency ranges, you should never buy the Blue 2.
Summary
In short, Blue 2 is bad.
Image credit: my friend, he is on X
Truthear Zero
Truthear’s Zero is a series of earphones developed in collaboration with Crinacle, a well-known audio reviewer and the creator of In-Ear Fidelity—a site dedicated to headphone and earphone measurements, where rankings are largely based on measured data rather than subjective impressions. Crinacle has since stepped back from actively updating In-Ear Fidelity to focus on Hangout Audio, a retail platform that offers earphones from various brands, including his own CrinEar line.
The newest entry in the Truthear Zero lineup—following the Blue and Red models—is the Blue 2.
Truthear Zero: Blue 2
The Truthear Zero: Blue 2 is a dual dynamic driver IEM, featuring a 10mm driver dedicated to bass and a 7.8mm driver handling mids and highs. The bass driver uses a solid silica gel suspension with a composite liquid crystal dome, while the mid-high driver is an upgraded polyurethane suspension unit, also with a liquid crystal dome.
Advanced manufacturing techniques—such as DLP-3D printing for the cavity and a silicone capping method typically found in higher-end products—are employed in the Blue 2. It also boasts a redesigned cavity structure and a low-distortion frequency crossover, aimed at improving driver efficiency and ensuring each unit performs its specific role effectively.
Non Audio stuff
The ear shells of the ZERO: Blue 2 are crafted from medical-grade resin and 3D printed by the reputable manufacturer HeyGears. While it retains the core design of the original model, the Blue 2 introduces a refreshed faceplate design, an optimized nozzle size, and refined support angles for improved fit and performance.
The main body features a sleek, glossy black finish, while the faceplates display an intricate blue pattern reminiscent of interwoven leaves or insect wings. Visually striking yet not overly bulky, the ZERO: Blue 2 is lightweight, comfortable to wear, and provides good passive noise isolation—despite its three venting holes.
Cable and accessories
The Truthear Zero: Blue 2 comes with a detachable 2-pin cable of solid quality. It’s a dual-strand coaxial cable combining copper and silver-plated wiring, encased in a durable rubber sheathing that resists tangling and exhibits only minimal microphonic noise. For an additional $5, you can opt for a version that includes a secondary cable with an in-line microphone and controls.
The package also includes a stylish carrying pouch, three pairs of silicone ear tips, and four pairs of memory foam tips. Additionally, a 3.5mm 5Ω impedance adapter is included, designed to enhance the bass response.
Power stuff
The Zero: Blue 2 has an impedance of 5.2Ω and a sensitivity of 119.5dB/Vrms. While it may appear easy to drive on paper, its low impedance demands a source capable of delivering ample current—something not all portable USB DAC dongles can handle effectively.
Moreover, the earphones are quite sensitive to background hiss, so a clean, low-noise source is essential. For this review, most of the listening was done using the FiiO KA15 and iBasso DC07PRO USB DAC dongles, occasionally paired with an aftermarket balanced cable.
Audio stuff
The manufacturer recommends using the included memory foam ear tips to achieve the best tonal balance.
The tuning of the Truthear ZERO: Blue 2 largely follows the Harman target curve, with some deviations—most notably, a generous bass boost. It's clearly designed for listeners who enjoy a warm, fun, and engaging sound signature over strict tonal accuracy. While it may not be ideal for reference or analytical listening, the Blue 2 delivers an energetic and enjoyable experience across a wide range of music genres.
Bass is where the Blue 2 shines. It offers excellent sub-bass extension and a rich, full-bodied low-end that reaches into the lower mids without significantly muddying the overall sound. The bass is punchy, impactful, and surprisingly clean, delivering deep rumble and satisfying weight without distortion. Technically, it performs well for its class—the bass is reasonably fast and tight, though it can lose a bit of control and clarity when tracks become densely layered. Still, it holds its own and remains impressive for the price point.
The mid-range of the Zero: Blue 2 is surprisingly clear and well-articulated, even with its pronounced mid-bass. It offers a satisfying sense of presence, with decent harmonic richness and good tonal accuracy. The timbre leans natural, with a lush and weighted texture that brings music to life. Vocals remain distinct and engaging, even in bass-heavy pop tracks. The upper mid-range is slightly elevated to add energy and excitement, though it can occasionally come across as mildly fatiguing depending on the track and listener sensitivity.
Treble performance varies with ear tip choice—smoother and more relaxed with memory foam tips, while sounding crisper and more forward with silicone. Regardless of the tip used, the treble is lively and sparkly with a subtle brightness. Clarity, separation, and detail are solid for the price, though the Blue 2 falls a bit short in overall resolution and fine texture refinement.
Timbre is generally good, offering a full-bodied sound that avoids thinness. However, there's a slight artificial edge to the timbre that affects realism. At higher volumes, the treble can become harsher and more metallic, so the Blue 2 tends to perform best at moderate listening levels.
The soundstage is fairly intimate, lacking in spaciousness both in width and depth, but imaging is respectable with less complex material. It handles solo vocals and small ensembles with convincing placement, though it struggles to maintain clarity and separation in larger-scale or more demanding compositions.
The impedance adapter
Instead of using interchangeable nozzle filters or tuning switches, the Truthear ZERO: Blue 2 opts for a simpler approach—a 5Ω impedance adapter to enhance the bass response. While this method is easy to use, it comes with a key limitation: it only works with single-ended connections, so you won’t be able to use it with balanced cables if you want that extra bass boost.
The adapter significantly elevates the bass from the sub-bass through the mid-range, effectively turning the Blue 2 into a bass-head IEM. However, this comes at the cost of tonal balance—mid-range clarity takes a hit, and the bass becomes looser and less controlled. Still, it's a fun option that many listeners will appreciate, especially those who enjoy a more powerful and immersive low-end.
Conclusion
With so many earphones at this price point tuned to the Harman target curve, it’s fair to ask—why choose the Truthear Zero: Blue 2 over alternatives like the Truthear Gate?
The answer lies in its unique take on the Harman tuning. The Blue 2 offers a more pronounced bass boost while keeping the mids and treble clean and engaging. For those who enjoy a richer low-end without sacrificing too much clarity, this tuning hits a sweet spot. Plus, with the included impedance adapter, you can easily push it into bass-head territory.
Beyond sound, the Blue 2 stands out for its solid build quality, comfortable fit, and generous accessory package—making it a compelling choice in a highly competitive market.
-------------------------------------------------------------------------------
The review sample was kindly provided free of charge in exchange for an honest review. I don't use affiliate links or get any other compensation.
The price of the Truthear Zero: Blue 2 is $64.99 and you can buy it from Shenzhen Audio.
Disclaimer: For various Google indexing reasons, most parts of this review have been processed with an automatic paragraph rewriting tool. However it reads exactly the same as the original content that is available in my website.
Truthear’s Zero is a series of earphones developed in collaboration with Crinacle, a well-known audio reviewer and the creator of In-Ear Fidelity—a site dedicated to headphone and earphone measurements, where rankings are largely based on measured data rather than subjective impressions. Crinacle has since stepped back from actively updating In-Ear Fidelity to focus on Hangout Audio, a retail platform that offers earphones from various brands, including his own CrinEar line.
The newest entry in the Truthear Zero lineup—following the Blue and Red models—is the Blue 2.
Truthear Zero: Blue 2
The Truthear Zero: Blue 2 is a dual dynamic driver IEM, featuring a 10mm driver dedicated to bass and a 7.8mm driver handling mids and highs. The bass driver uses a solid silica gel suspension with a composite liquid crystal dome, while the mid-high driver is an upgraded polyurethane suspension unit, also with a liquid crystal dome.
Advanced manufacturing techniques—such as DLP-3D printing for the cavity and a silicone capping method typically found in higher-end products—are employed in the Blue 2. It also boasts a redesigned cavity structure and a low-distortion frequency crossover, aimed at improving driver efficiency and ensuring each unit performs its specific role effectively.
Non Audio stuff
The ear shells of the ZERO: Blue 2 are crafted from medical-grade resin and 3D printed by the reputable manufacturer HeyGears. While it retains the core design of the original model, the Blue 2 introduces a refreshed faceplate design, an optimized nozzle size, and refined support angles for improved fit and performance.
The main body features a sleek, glossy black finish, while the faceplates display an intricate blue pattern reminiscent of interwoven leaves or insect wings. Visually striking yet not overly bulky, the ZERO: Blue 2 is lightweight, comfortable to wear, and provides good passive noise isolation—despite its three venting holes.
Cable and accessories
The Truthear Zero: Blue 2 comes with a detachable 2-pin cable of solid quality. It’s a dual-strand coaxial cable combining copper and silver-plated wiring, encased in a durable rubber sheathing that resists tangling and exhibits only minimal microphonic noise. For an additional $5, you can opt for a version that includes a secondary cable with an in-line microphone and controls.
The package also includes a stylish carrying pouch, three pairs of silicone ear tips, and four pairs of memory foam tips. Additionally, a 3.5mm 5Ω impedance adapter is included, designed to enhance the bass response.
Power stuff
The Zero: Blue 2 has an impedance of 5.2Ω and a sensitivity of 119.5dB/Vrms. While it may appear easy to drive on paper, its low impedance demands a source capable of delivering ample current—something not all portable USB DAC dongles can handle effectively.
Moreover, the earphones are quite sensitive to background hiss, so a clean, low-noise source is essential. For this review, most of the listening was done using the FiiO KA15 and iBasso DC07PRO USB DAC dongles, occasionally paired with an aftermarket balanced cable.
Audio stuff
The manufacturer recommends using the included memory foam ear tips to achieve the best tonal balance.
The tuning of the Truthear ZERO: Blue 2 largely follows the Harman target curve, with some deviations—most notably, a generous bass boost. It's clearly designed for listeners who enjoy a warm, fun, and engaging sound signature over strict tonal accuracy. While it may not be ideal for reference or analytical listening, the Blue 2 delivers an energetic and enjoyable experience across a wide range of music genres.
Bass is where the Blue 2 shines. It offers excellent sub-bass extension and a rich, full-bodied low-end that reaches into the lower mids without significantly muddying the overall sound. The bass is punchy, impactful, and surprisingly clean, delivering deep rumble and satisfying weight without distortion. Technically, it performs well for its class—the bass is reasonably fast and tight, though it can lose a bit of control and clarity when tracks become densely layered. Still, it holds its own and remains impressive for the price point.
The mid-range of the Zero: Blue 2 is surprisingly clear and well-articulated, even with its pronounced mid-bass. It offers a satisfying sense of presence, with decent harmonic richness and good tonal accuracy. The timbre leans natural, with a lush and weighted texture that brings music to life. Vocals remain distinct and engaging, even in bass-heavy pop tracks. The upper mid-range is slightly elevated to add energy and excitement, though it can occasionally come across as mildly fatiguing depending on the track and listener sensitivity.
Treble performance varies with ear tip choice—smoother and more relaxed with memory foam tips, while sounding crisper and more forward with silicone. Regardless of the tip used, the treble is lively and sparkly with a subtle brightness. Clarity, separation, and detail are solid for the price, though the Blue 2 falls a bit short in overall resolution and fine texture refinement.
Timbre is generally good, offering a full-bodied sound that avoids thinness. However, there's a slight artificial edge to the timbre that affects realism. At higher volumes, the treble can become harsher and more metallic, so the Blue 2 tends to perform best at moderate listening levels.
The soundstage is fairly intimate, lacking in spaciousness both in width and depth, but imaging is respectable with less complex material. It handles solo vocals and small ensembles with convincing placement, though it struggles to maintain clarity and separation in larger-scale or more demanding compositions.
The impedance adapter
Instead of using interchangeable nozzle filters or tuning switches, the Truthear ZERO: Blue 2 opts for a simpler approach—a 5Ω impedance adapter to enhance the bass response. While this method is easy to use, it comes with a key limitation: it only works with single-ended connections, so you won’t be able to use it with balanced cables if you want that extra bass boost.
The adapter significantly elevates the bass from the sub-bass through the mid-range, effectively turning the Blue 2 into a bass-head IEM. However, this comes at the cost of tonal balance—mid-range clarity takes a hit, and the bass becomes looser and less controlled. Still, it's a fun option that many listeners will appreciate, especially those who enjoy a more powerful and immersive low-end.
Conclusion
With so many earphones at this price point tuned to the Harman target curve, it’s fair to ask—why choose the Truthear Zero: Blue 2 over alternatives like the Truthear Gate?
The answer lies in its unique take on the Harman tuning. The Blue 2 offers a more pronounced bass boost while keeping the mids and treble clean and engaging. For those who enjoy a richer low-end without sacrificing too much clarity, this tuning hits a sweet spot. Plus, with the included impedance adapter, you can easily push it into bass-head territory.
Beyond sound, the Blue 2 stands out for its solid build quality, comfortable fit, and generous accessory package—making it a compelling choice in a highly competitive market.
-------------------------------------------------------------------------------
The review sample was kindly provided free of charge in exchange for an honest review. I don't use affiliate links or get any other compensation.
The price of the Truthear Zero: Blue 2 is $64.99 and you can buy it from Shenzhen Audio.
Disclaimer: For various Google indexing reasons, most parts of this review have been processed with an automatic paragraph rewriting tool. However it reads exactly the same as the original content that is available in my website.
𝐓𝐑𝐔𝐓𝐇𝐄𝐀𝐑 𝐗 𝐂𝐑𝐈𝐍𝐀𝐂𝐋𝐄 𝐙𝐄𝐑𝐎 𝐁𝐋𝐔𝐄 ߶ 𝐑𝐄𝐕𝐈𝐄𝐖:
Truthear x Crinacle Zero Blue 2 is a new 2DD release from the Truthear, continuing the Zero lineup, specifically the Blue series, which has won the hearts of both avid gamers and experienced audiophiles. The model was released by Truthear in collaboration with the well-known YouTube reviewer Crinacle, who has a deep understanding of high-quality sound. His tuning often resembles the Harman 2019 target, featuring a balanced V-shaped frequency response with an emphasis on high frequencies. Here, in the Blue 2, I expect a similar balanced Harman-like presentation with plenty of energy and resolution in the high frequencies. The new model was announced on Truthear’s Twitter account in March and immediately went on sale for $65, the same price as its predecessor, the Zero Blue OG.
Truthear is a relatively young Chi-fi company, founded in 2022, which gained popularity largely due to its collaborations with Crinacle. Their models, TRUTHEAR x Crinacle ZERO: Red and TRUTHEAR x Crinacle ZERO: Blue, were widely discussed. These were among the first IEMs with a 2DD configuration that implemented a subwoofer system, resulting in a fairly massive and deep sound. These models were well-received by both audiophiles and gamers. Of course, those IEMs had their flaws, but I hope the new model addresses them, which I’ll try to find out in this review.
Now, let’s return to the new release. Three years after the launch of the TRUTHEAR x Crinacle ZERO: Blue, Truthear, together with Crinacle, introduces an updated model—the Zero Blue 2. It inherits the same 2DD dual dynamic driver configuration but with improved drivers. This means the Blue 2 features a 10mm dynamic driver responsible for low frequencies, with an updated silicone voice coil and liquid crystal diaphragm, which should enhance the bass, making it deeper and smoother. Additionally, the model includes an enlarged 7.8mm dynamic driver with an LCP diaphragm and a dual-magnet system for mid and high frequencies.
The model uses passive crossover technology, meaning each driver reproduces only the frequency range it’s designed for. This helps eliminate distortion and sound overlap, providing a cleaner and more natural sound. The model retains the same faceplate design but comes with improved housings, which I’ll discuss in more detail later.
Truthear x Crinacle Zero Blue 2 is available in two variants: a model with a single cable without a microphone, and for an additional $5, you can purchase a version that includes an extra cable with an angled plug, a microphone, and a volume control.
Now, let’s take a closer look at the new Blue 2, starting, as always, with the specifications.
Hello, and thanks for taking the time to read my review. I really appreciate it!
I’m Vlad, a former semi-pro FPS player, mainly in CS:GO, and now an audiophile and reviewer of audio devices.
My passion for music started with a classic Japanese Panasonic boombox. Later, I got my first headphones - Koss Porta Pro, which I absolutely loved. I spent years listening to music on those and the Sennheiser CX200. Back then, my playlists were filled with Linkin Park, DMX, Dr. Dre, and Eminem. Hip-hop and rap captivated me, especially the deep, rumbling bass and the distinct rap-style delivery.
Now, I consider myself a music enthusiast who enjoys a wide range of genres, from metal to classical music, choosing what to listen to based purely on my mood.
When it comes to sound, I prefer a neutral-warm V-shaped tuning. I appreciate a rumbling, well-defined bass and would consider myself more of a basshead than a treblehead. In the midrange, I have a particular fondness for male vocals, as I find them the most engaging and essential in modern music. What do I dislike? Harsh treble, a lack of bass, and a narrow soundstage.
You can learn more about me in my portfolio
I’m Vlad, a former semi-pro FPS player, mainly in CS:GO, and now an audiophile and reviewer of audio devices.
My passion for music started with a classic Japanese Panasonic boombox. Later, I got my first headphones - Koss Porta Pro, which I absolutely loved. I spent years listening to music on those and the Sennheiser CX200. Back then, my playlists were filled with Linkin Park, DMX, Dr. Dre, and Eminem. Hip-hop and rap captivated me, especially the deep, rumbling bass and the distinct rap-style delivery.
Now, I consider myself a music enthusiast who enjoys a wide range of genres, from metal to classical music, choosing what to listen to based purely on my mood.
When it comes to sound, I prefer a neutral-warm V-shaped tuning. I appreciate a rumbling, well-defined bass and would consider myself more of a basshead than a treblehead. In the midrange, I have a particular fondness for male vocals, as I find them the most engaging and essential in modern music. What do I dislike? Harsh treble, a lack of bass, and a narrow soundstage.
You can learn more about me in my portfolio
I would like to thank Shenzhenaudio store and especially Cloris for providing me with the opportunity to test and review this product. Your support makes this review possible. I am very grateful to you and your team. Many thanks to you!
Disclaimer: My review is my personal, honest opinion about the product. I don't receive any income for conducting reviews and I don't participate in any affiliate programs. All thoughts expressed in this review are purely subjective and may not coincide with your own impressions. Trust your ears!
You can purchase the Truthear x Crinacle Zero Blue 2 from:
Shenzhenaudio store: https://shenzhenaudio.com/products/...oblue2-dual-dynamic-drivers-in-ear-headphone;Aliexpress Shenzhenaudio store: https://www.aliexpress.com/item/1005008606126729.htmlAmazon US store: https://a.co/d/3fPTdq3
- 2DD Driver Configuration;
- Impedance: 5.8Ω + 15%;
- Sensitivity: 119.5dB / Vrms;
- Frequency Response Range: 9-41kHz (IEC61094, Free Field);
- Effective Frequency Response Range: 20-20kHz (IEC60318-4, -3dB);
- Connector: 2 pin 0.78mm.;
- Cable material: OFC Silver Plating + OFC Coaxial, length 1.2m;
- Price:65$.
- IEM itself - Truthear x Crinacle Zero Blue 2;
- 2-strands 294 cores high-quality copper and silver-plated coaxical cable, 1.2m length;
- 2 sets, 7 pairs of eartips: 3 pairs of silicone gray eartips with standard bore (S / M / L), 3 pairs of foam eartips (M), 1 pair of foam eartips (S);
- 5Ω impedance adapter;
- Carrying case;
- User manual;
- Warranty card;
- Anime card.
Zero Blue 2 comes in a compact white box featuring an illustration of an anime character, the model name "Zero Blue:2", and the Truthear and Crinacle logos on the front. On the back panel, you'll find the specifications, manufacturer information, and a frequency response graph. Honestly, having an FR graph on the box is very convenient, as it gives you an immediate idea of the IEM’s potential sound signature.
After removing the outer sleeve, we see the inner box, which has a linear abstract design with the model name displayed in the center. Inside, there is a brief user manual, followed by the shells, neatly embedded in a foam panel. Below them, there’s a branded carrying pouch, which contains the cable and a bass adapter. Additionally, the package includes a panel with a wide selection of eartips, a small instruction manual, and a postcard featuring the anime character from the front cover.
As for the carrying pouch, it is made of vegan leather, pleasant to the touch, soft yet sturdy, and compact while still spacious inside. It can easily fit your IEMs, cable, and even a small DAC if needed. Despite its capacity, the pouch fits comfortably in your jeans pocket, making it convenient for everyday use.
The Truthear x Crinacle Zero Blue 2 shells are made of medical-grade resin using 3D printing technology. The resin is completely opaque, so the internal drivers are not visible.
The design of the Blue 2 is mesmerizing! It resembles its predecessor, the Truthear x Crinacle Zero, but with several key differences. Let me go into more detail.
The faceplate of the Blue 2 is adorned with an abstract pattern that reminds me of flower petals, presented in shades of blue with embedded glitter. This creates a smooth blue gradient that shimmers under light.
The inner side of the Blue 2 has also changed compared to the Zero OG. The sound nozzle is now positioned at a more optimal angle, while its length remains roughly the same, but the diameter has been reduced to 6.2mm. If you found the original Zero uncomfortable, expect significant improvements here. The fit and comfort have been greatly enhanced, and this is definitely worth noting. Thank you, Truthear, for listening to user feedback!
On the side of the shell, there are a couple of vent holes, the Truthear labeling, R/L side indicators, and, of course, a 2-pin connector.
Overall, Truthear has done a great job with a redesign and improved sound nozzle, which has had a direct impact on comfort and fit. By the way, it's worth mentioning in more detail.
Indeed, Truthear, in collaboration with Crinacle, has done an excellent job redesigning the Blue 2 shells, making them significantly more comfortable than their predecessor. Let’s dive into the details.
The Zero Blue 2 features medium sized shells that are quite lightweight, weighing 4.5 grams each, yet they fill the earcup securely and snugly. The shells themselves have been completely redesigned. They are made from medical-grade resin, and their width has been reduced, allowing Truthear to incorporate two dynamic drivers inside.
I wouldn’t call the Blue 2’s shape ergonomic, it’s rather sleek. The shells have no sharp edges or abrupt curves, which definitely adds to the comfort. The fit is noticeably better compared to the original version.
Truthear has fixed the biggest issue with the shells - the nozzle diameter. As we remember, the first version of the Zero Blue had a 6.8 mm nozzle, which caused discomfort, especially for those with smaller ears. In the Blue 2, the diameter has been reduced to 6.2 mm, and adjusted the angle, and trust me, this has genuinely improved the fit.
The fit here is tight and deep. The shells easily slide into my small ears, and the nozzle no longer presses uncomfortably against the ear canal walls like it did in the OG Blue.
With these IEMs, I experience no issues with fit or discomfort, even during long listening sessions. Well done, Truthear!
When it comes to sound isolation, things aren’t quite as impressive. The Zero Blue 2 blocks only about 40-50% of external noise. Yes, the deep fit helps, but due to the three vents on the side of the shells, external sounds can easily get inside and mix with the music. Because of this, I would recommend using these IEMs in quiet environments where nothing and no one would disturb you from enjoying your favorite music.
The stock cable included with the Zero Blue 2 is of high quality. It doesn’t feel cheap and has been upgraded since the original Zero. The cable is made of a two-core wire, with each core consisting of 294 strands of high-purity silver-plated copper (OFC), encased in a dense polyurethane (PU) sheath to protect it from external damage.
According to Truthear, the number of strands has been increased, which theoretically improves sound quality and ensures a seamless listening experience.
One end of the cable features a straight 3.5 mm mini-jack in a metal housing, a branded metal splitter in the middle, and ear hooks with 2-pin connectors and channel indicators at the other end, styled like the Zero OG.
By the way, you can also purchase the Zero Blue 2 with two cables, one of which comes with an in-line microphone.
Overall, this is a solid cable, and I wouldn’t recommend replacing it. It offers everything a typical user needs - convenience, reliability, and good signal transmission quality.
The Zero Blue 2 comes with a branded blister case containing ear tips. The set includes three pairs of gray silicone ear tips (S / M / L) with a standard bore. These are made of high-quality silicone, which is soft, flexible, and holds its shape well. However, their sound isolation is noticeably inferior to foam ear tips.
Additionally, the package includes four pairs of foam ear tips (three pairs in size M and one in size S), subtly suggesting that the bass is dominant and should be emphasized with the appropriate ear tips. These foam tips provide a tight and deep fit but slightly narrow the soundstage while deepening it, pushing the lows to the forefront. This can cause the bass to overpower the mids and treble , resulting in a less balanced sound.
In my reviews, I prefer not to use foam ear tips, as I try to achieve the most natural sound presentation possible. That’s why, in this case, I’ll be using the included gray silicone ear tips, which offer a more neutral and transparent result, better reflecting the true tuning of the IEMs.
The Zero Blue 2 boasts an impressively low impedance of just 5.8Ω and a sensitivity of 119.5dB, theoretically making them a versatile option for any device, from budget smartphones to motherboards with integrated sound cards. However, this isn’t entirely the case.
While this set performs decently on such devices, its true potential scales with the power of the source. The Zero Blue 2 was designed with professional equipment in mind, and to truly shine and match its intended sound signature, it requires at least a portable DAC.
I tested the Zero Blue 2 with a variety of sources, including the Apple dongle, FiiO KA11, Celest CD-2, Tanchjim Stargate 2, as well as desktop options like the Fosi Audio K7 and Qudelix 5K.
I can confirm that the set sounds best with the latter two, delivering a more expansive, technical, and accurate performance, though it still performs well with all the DACs listed above.
My recommendation is to pair the Zero Blue 2 with at least a portable DAC to achieve its proper sound.
Even Crinacle emphasizes that you should use a DAC with the Zero Blue 2, at the very least a basic one from Apple.
Let me remind you that the Zero Blue 2 are 2DD IEMs, and in terms of sound, the engineers aimed to closely align with the Harman 2019 target curve. Based on the graph, these are V-shaped IEMs with enhanced bass extension, a smooth transition to the mids, retuned upper mids, and extended treble to better match the Harman 2019 curve.
In reality, the Zero Blue 2 are balanced, neutral V-shaped IEMs with a slight warm tonal tint. The midbass is subtly emphasized, as is the upper midrange, adding musicality and expressiveness. The treble is energetic yet stays within the bounds of brightness, delivered cleanly, controlled, and free of harsh peaks.
Overall, the sound signature of the Blue 2 caters to a wide audience and feels familiar to many, but its standout feature is its near-perfect execution. This isn’t just another "Harman-style" IEM, this is a mature and complete realization that blends naturalness, detail, and musicality.
Imagine listening to a demo of your favorite song through high-quality studio monitors - that’s exactly how the Truthear x Crinacle Zero Blue 2 sound like.
Sub-Bass: Punchy, resonant, and deep, especially when using the bass adapter, where it dives even deeper. The sub-bass in the Zero Blue 2 is expansive, achieved through a meaty rumble. I wouldn’t call it heavy or lacking in texture, but rather the opposite. It’s technical, controlled, and precise in texture.
The sub-bass is palpable in every attack, with a smooth rise and gradual decay. This sound doesn’t overpower the rest of the frequency range but is distinctly felt, adding weight and depth to the entire track.
To describe the sub-bass, I chose a dubstep track by Skrillex feat. Damian Marley, "Make It Bun Dem" In this track, the sub-bass literally rumbles, resonates, and feels like it vibrates through your entire body, not just as sound in your ears. It comes across as a full, expansive sound with scale and presence. This is exactly how sub-bass should sound in IEMs like these: powerful, voluminous, and without sacrificing control.
Mid-Bass: Boomy, deep, with a dense, meaty texture and a well-defined body. It has excellent extension, is accentuated, yet doesn’t overpower the rest of the frequency range. Instead smartly complementing the overall tuning, adding weight and fullness to the sound.
Since these IEMs are partially aimed at gamers, the midbass is well-controlled and technically precise. It has clear boundaries and reproduces sound strictly within its frequency range. The bass contour is sharp, which is particularly important for complex genres and dynamic gaming scenes.
To describe the midbass, I chose the iconic electronic track by AronChupa feat. Little Sis Nora, "I'm an Albatraoz" This track highlights the technicality and clarity of the bass, with the bass sounding like a parabola, it smoothly and deeply dips down and rises back up just as smoothly, without creating layering or a muddy effect. The bass here is vibrant, resonant, and dense.
This kind of midbass allows you to fully enjoy the track’s dynamics without sacrificing accuracy
Midrange: In the midrange, the Blue 2 exhibits a clear surge of energy. If you take a look at the graph, you’ll notice a smooth rise from 500 Hz to the upper mids, which is distinctly audible in the sound. The character of the mids is balanced, neutral, and technically restrained. This range is positioned closer to the listener, strongly hinting that the Blue 2 is tailored for gamers, where midrange frequencies account for about 80% of the gaming atmosphere.
Instruments, I would say, are well-defined yet maintain their neutral character. In other words, the instrumental presentation is reproduced as it should be, without coloration. A guitar sounds like a guitar, a piano remains uncolored, and a violin isn’t overly bright. Everything is as it should be, with no attempt to embellish the original sound. Vocals take precedence over instruments and sit at the forefront, which is expected for a tuning close to the Harman target.
Speaking of vocals, they are natural and full-bodied. This set doesn’t focus on capturing microdetails of the voice, so you likely won’t catch every breath of Sinatra or Presley. However, what it does deliver is an honest, technically accurate presentation with proper tone and weight. The accentuated vocals are particularly noticeable in lyrical, slow tracks, where the focus is on the performer rather than the instrumental accompaniment.
The upper mids have indeed been reworked. The graph shows a peak around 3.5 kHz, fully aligning with the Harman 2019 curve. As a result, the upper mids are vibrant, energetic, and lively. Vocals in this region become clear and bright, with sharper imaging and a sense of air movement. The upper mids are one of the strongest aspects of these IEMs. It doesn’t overwhelm the listener but instead blends organically into the overall sound, avoiding listener fatigue.
To describe the midrange, I chose "The Silence" by Manchester Orchestra. This is an excellent track with both instrumental depth and vocal versatility. Right from the start, you get a deep, punchy drum, followed by a melodic piano and hints of an energetic electric guitar. The vocalist’s voice is maximally natural and tonally diverse, though, as mentioned, it slightly lacks microdetails. The transition to the upper mids feels smooth and refined. The high vocal peaks are piercing and bright, and to me, just a bit sharp.
Treble: Piercing, sparkling, clean, and bright. I’d say they’ve infused too much energy into the treble, making it both bright and sharp at times. This isn’t noticeable with cymbal crashes, violins, or bells, but it’s clearly evident in the upper vocal peaks. The sounds can become overly bright, almost piercing to the ears.
However, it’s worth noting that the Blue 2’s tuning helps to mitigate this sharpness. It slightly extends the decay, allowing the treble to fade more smoothly without crumbling or unnatural cutoffs.
To describe the treble, I chose a track with rich high-pitched vocals, Beyoncé’s - "Halo". This track perfectly showcases the piercing, almost sparkling peaks of her voice, interwoven with airy, bright instrumental accompaniment. The result is a lively, energetic, and colorful sound, while still maintaining a sense of clarity and transparency.
The soundstage in the Zero Blue 2 is wide, spacious, and fairly deep. It feels like a large circle where all the instruments and vocals are placed. In terms of frequency placement within a track, I’d place the mids at the forefront, as it sets the main tone and atmosphere. Next comes the bass, which is well-controlled and sits slightly behind, while the treble sits further back, primarily shining through during peak moments without overwhelming the overall picture.
These aren’t IEMs I’d describe analytical, but rather, they’re technical. As a result, there are no issues with separation or imaging. All sounds are clearly delineated from one another and occupy their own space, making it easy to pinpoint the source of each sound.
Gaming Impressions
In gaming, the Zero Blue 2 performs exceptionally well, which is no surprise since they were designed specifically to deliver top-tier gaming experiences. I spent a lot of time with the Blue 2 playing competitive FPS shooters, and I can confidently say that my in-game performance noticeably improved. The sound tuning is near-perfect for shooters and games where positioning is critical for success. The soundstage is wide, with midrange frequencies taking precedence over the bass, ensuring that gunshots don’t turn into a muddy rumble, while footsteps and other environmental sounds are conveyed accurately and clearly. The positioning is outstanding. I had no trouble determining both the distance and direction of sounds. This is a definite upgrade over the original Zero, making the Blue 2 an excellent choice not only for music but also for gaming.
- vs Truthear x Crinacle Zero(60$):
Both models are tuned to the Harman 2019 curve and share many similarities in sound, but the Zero Blue 2 feels like an upgraded version across the entire frequency range. Let’s dive into the comparison.
The bass in the original Zero Blue is accentuated, powerful, and deep, but slightly smeared and less controlled. The Blue 2 significantly improves on this. Its bass is denser, more defined, and better extended. When using the bass adapter, the sound becomes closer to the original Zero, which may appeal to fans of its signature presentation.
The mids in the Zero Blue are fairly detailed but tend to be overshadowed by the dominant bass. In contrast, the Blue 2’s mids sound more natural and uncolored, making the model versatile for both music listening and gaming. Vocals and instruments are delivered vividly with excellent articulation.
The treble in the Zero Blue is balanced with slight peaks in the brilliance region, which can create a sense of brightness. The Blue 2’s treble is more extended, allowing for smoother decay, yet it retains that characteristic sparkle. As a result, the treble sounds bright but can also feel sharp at times.
In my opinion, in 2025, the original Zero is losing its relevance, making the Blue 2 a logical and more practical choice for both gamers and those who appreciate the original sound signature but in a slightly refined and more balanced form. The improvements are immediately noticeable and felt in every aspect of the sound.
The Truthear x Crinacle Zero Blue 2 are 2DD IEMs created in collaboration between Truthear and well-known audio reviewer Crinacle. This model introduces several improvements over its predecessor, including a refreshed design, redesigned dynamic drivers, an optimized shell shape, an adjusted nozzle angle, and, most importantly, a reduced nozzle diameter. As a result, these IEMs no longer feel bulky and fit comfortably in small to medium-sized ears.
The sound signature has also been improved. The Zero Blue 2 now sounds more closely with the Harman 2019 target curve. The bass is more controlled, with enhanced extension and depth. The midrange is even more natural and clean, free from excessive coloration, while the treble is extended and piercingly bright. The soundstage is spacious and wide, allowing instruments and vocals to be placed without feeling cramped or muddy. Positioning and imaging are top-notch.
The tuning of the Zero Blue 2 is versatile, making it well-suited for avid gamers who prioritize soundstage and precise positioning, as well as audiophiles seeking a balanced and natural Harman sound signature. These IEMs offer something for everyone.
General Information (Build/Packaging/Comfort)
Zero II is a collaboration between Truthear and Crinacle, an improvement/tweak over the OG. It is a dual dynamic driver config where the 10mm dynamic driver is acting as a dedicated woofer handling mainly the sub bass while the main 7.8mm driver handles the rest of the frequency range. The Zero II has upgraded driver with some refinements, also noticeably smaller nozzle size.
Zero II has got a very beautiful faceplate. It's 3D printed and the unit is very light and I don't feel the weight on me when I'm wearing them. The design and shell size is more or less similar to the OG
Packaging is quite good for the price, it has got two types of eartips with various sizes, a storage pouch for the IEM, and basic cables, overall justifiable by the asking price, also, the inclusion of a 5 Ohm adapter which boost the low end by quite a bit, which i will discuss more later.
Gears used for this review
- iFi Zen Dac 3
- Earmen L-Amp
- Truthear Zero II with stock eartips and cables
My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone’s ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far
Sound
I’m sure most of you guys are aware that Zero is closely following the Harman curve in terms of tuning, but with a twist, that is including a dedicated woofer crossed over with the main driver. Well, in a layman’s term, the dedicated woofer will be handling the sub-bass while the main will cover the mid bass all the way to treble.
How does it sound then? The OG Zero is quite bassy, the moment when i listened to Zero II, the difference is very noticeable, in a good way of course, bass quantity is slightly lesser but cleaner and has better control, it is more balanced sounding overall, if you find the bass is lacking, the included 5ohm adapter will do the job, the lows to me are significantly boosted, thick and thumpy, i would say it is basshead kind of preference.
Timbre sounds quite natural to my ears while the note weight is also quite good across the freq range.
The vocal positioning is slightly recessed on the male but female’s vocal is a little bit more forward but not harsh, both male and female vocal has got similar texture to it and they’re not bad or exceptionally good. When the 5ohm adapter is being used, the vocals will be slightly pushed backwards. The midrange is generally clean and good, but i’d prefer if it has got a little bit more texture to it, the piano to me lacks a little weight to it in my opinion, but that’s just me, i let my spouse tried it (non-audiophile) and she likes it and doesn’t have anything to complain about, but me as a reviewer of course i have to highlight the pros and cons
The treble response is energetic but non sibilant, a very safe approach for me, and I'm sure even the treble sensitive guys/girls will be able to handle it. Detail retrieval is good enough for the price. Definitely not for critical listening, compared to the OG, the technicalities is definitely one step ahead.
Soundstage is slightly out of the head but lacking a little height and depth to my ears. Imaging is average, instruments can be picked up easily but of course it struggles a little on busy tracks.
Driveability
- Zero II does requires a little power to sound its best, with better and tighter bass response and also better dynamics overall
- Bass has more quantity but it is not as refined compared to Zero Blue II
- Vocal is slightly more recessed OG but also having a little more energy on the upper mids, this might be a little problematic for some people who are sensitive at this range
- In term of treble, the OG Blue is slightly darker and lacking a little air
- offensive sounding or harsh
- Detail retrieval on Titan S is slightly better
- Soundstage is more or less quite similar on both the OG and Zero Blue II
- With that said, if you are coming from the OG Blue, it is definitely an upgrade from my point of view
I don’t have any problem recommending Zero Blue II if you’re looking for some fun and to experience having a “dedicated” woofer handling the sub bass which does produce a very very fun rumble when the track calls for it. However, if you are mainly looking for something very analytical or you prefer something that is rather flat, you may skip this set, Zero Blue II is not for you. As for me, i am not someone who is fixated on a certain target curve, as long as it sounds good to my ears, i like them, as simple as that. I listen to music and I'm not trying to analyse every piece of information from the track.
*Zero Blue II is sent over by Shenzhenaudio for the purpose of this review. I thank them for the opportunity and support as always.
Head over to the store if you’re interested in getting a pair:
Zero Blue II - Non affiliated
A refinement on the Original but is it too "technical"?
Truthear’s collaborations with Crinacle have consistently aimed to deliver Harman-tuned excellence at budget-friendly prices. The Zero Blue 2 is the latest iteration of their dual dynamic driver (DD) IEM tries to outdo the previous Truthear Zero models, the original Zero and the Zero Red but did it “fly too close to the sun” with its treble tuning?It has been hard to ignore the hype both positive and negative surrounding this IEM and with Crinacle's new brand CrinEar also announcing 3 other IEMs it seems like this IEM has been under extra scrutiny, this is especially true with the main suggestion to only use Foam eartips.
However, after using the Zero Blue for a few weeks now (both the pre-production unit and production unit) I can confirm that tip selection can be crucial but not for everyone needs to worry and there are some other alternatives to using foam ear tips which i will present later in the review.
While Foam tips deliver an excellent Harman tuning even for those sensitive to upper treble by helping to dampen down the treble, I think the inclusion of the 5 Ohm adapter to boost the bass beyond Harman and even Crinacle own preferences indicate to me that a Harman++ shaped tuning with extra sub-bass balanced with extra upper treble was one of the goals of this IEM, but these options make the Zero Blue 2, a versatile high quality IEM to add to your collection.
I would like to thank Shenzhenaudio for providing the Zero Blue 2 for the purposes of this review.
If you are interested in finding more information about this product, you can check it out here.
But before we get into the sound, let’s dive into the unboxing experience.
Unboxing and Build Quality
Truthear keeps things minimalist but functional. The Zero Blue 2 arrives in a compact box:
I do like it when an IEM has a frequency response on the back which shows both the normal FR and the bass boosted one you get with the 5Ohm adapter:
Sliding the box out of its sleeve you get an internal box:
Opening up you get a brief manual:
Removing it you finally get to see the Blue 2 and the carry case:
Taking everything out of the box this is what you get:
Inside, you’ll find:
- The IEMs
- A soft carrying pouch
- A very decent detachable cable - this cable is similar but better than the one in the Truthear Gate:
- A good selection of ear tips (foam and silicone)
- A 5Ω adapter
The IEM Itself
The Zero Blue 2retains the sleek, transparent shell aesthetic:
The build quality is solid, feeling durable without being too heavy.
Comfort and Fit
The smaller nozzle makes a massive differencein comfort.
While the original Zero Blue had nozzle fit issues for many, the Zero Blue 2 resolves this and should accommodate more ear shapes without discomfort:
They have also changed the angle of the nozzle compared to the original:
Here are some size comparisons with the Truthear Zero:
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This for me is even more crucial for nozzle size as I do find the original and the Zero Red move slightly in my ear when I used them out walking but after a few days with the Zero Blue 2 I find it stays very secure with an excellent fit.
Technical Advancements over the original
Like its predecessors, the Zero Blue 2 features dual dynamic drivers, but with significant internal modifications. The 7.8mm driver, responsible for mids and highs, now utilizes a larger magnet (25% increase) and an expanded dome area (50% increase). These changes enhance conversion efficiency, treble extension, and overall resolution.The driver structure incorporates:
- LCP (Liquid Crystal Polymer) dome diaphragm for improved rigidity and transient response.
- Flexible polyurethane suspension to enhance smoothness in frequency transitions.
- Refined high-frequency conductive structure, leading to clearer, more transparent upper frequencies.
These advancements were designed to make the Zero Blue 2’s treble significantly more refined while retaining the Harman tuning balance in the lower frequencies, but does it go too far?
This is why I cheekily mentioned it might have “too much ’technicalities’” but let’s get onto my subjective opinions and these might surprise you a little.
Sound Impressions
The Truthear Zero Blue 2 continues to nail the Harman IE 2019 tuning, offering a balanced sound signature that should appeal to a wide audience while this time adding that extra technical prowess in the treble but also with the optional 5Ω adapter for bass heads. So there are quite a lot of options for those who like to tweak sound without using EQ.I only briefly used the adapter as normally for me, a Harman tuned IEM has a little too much bass but in this case, that added treble mostly balanced out nicely with very nice Harman “tuned” bass provided. I did play around with using both the silicon tips, foam tips and many other third party ear tips. It it wrong to say “silicon bad - foam good”, I would suggest find the ear tips that work for you as this IEM will respond differently to different eartips (as you will see in the measurements).
Overall impressions
Overall, I think the bass is exceptional better than the 2 previous Zero’s, the midrange is superb. And while I am more of a fan of a JM-1 like tuning, the specific treble peaks, that show up on the measurements, did not subjectively bother me at least. Treble is the area of massive subjective differences between how people hear things and I think this IEM with silicon tips might exaggerate this differences, it certainly does on the measurements rigs. As we get older that 15K / 16K upper treble can actually do with a boost in these regions as we move into our 40’s:
So for me, the Blue 2 sounded like it has we used to call “good technicalities”, that extra little “shimmer” on high-hats and a very detailed sound that many will appreciate. So, I would suggest giving the Zero Blue 2 a go, you might be surprised, especially if you are a fan of Harman tuning.
If there was one area of the treble that I personally would change, it is the 4-5K region, as I have come to appreciate a JM-1 tuning more over the past year but given even the most recent research shows
Harman and a JM-1 target are both perfectly acceptable ‘scientifically proven’ popular targets.
Here are some more details:
Bass
The dual DD configuration ensures a well-extended, clean bass response. Out of the box, bass is tight, punchy, and well-controlled, but those who prefer more warmth can use the included 5Ω adapter to increase low-end presence slightly.Test Track: “Billie Eilish - bad guy”
- Impactful and clean bass, no muddiness
- Great sub-bass extension without overpowering the mids
Mids
The midrange is neutral and clear, benefiting from the Harman tuning. Vocals are well-placed and transparent, never too recessed or too forward.Test Track: “Fleetwood Mac - Dreams”
- Vocals are natural and textured
- Acoustic instruments sound organic and lifelike
Treble
Treble is where the Zero Blue 2 differs the most from its predecessor. High frequencies are **more detailed and airy **, giving the IEMs a sense of greater technical precision. However, as I mentioned earlier if you are suspectable to treble sibilance the silicone tips might make treble overly sharp for you. While foam tips dampen things perfectly..Test Track: “Daft Punk - Giorgio by Moroder”
- Cymbals and high hats are crisp and resolving
- With Silicone tips it was excessibe brightness
Soundstage & Imaging
The Zero Blue 2 has a spacious soundstage for an IEM in this price range. Imaging is precise, allowing instruments to be well-placed across the stereo field, this is one area where extra treble can help allowing the upper harmonics of certain instruments stand out given them depth.Specifications and Measurements
| Model | ZERO:BLUE2 |
| Driver | 10mm + 7.8mm Dynamic Drivers |
| Diaphragm | LCP Liquid Crystal & Polyurethane Suspension |
| Impedance | 5.8Ω ±15% @1kHz |
| Sensitivity | 119.5dB/Vrms @1kHz |
| THD | <0.3% @1kHz @94dB |
| Frequency Range | 9-41kHz (IEC61094, Free Field) |
| Effective FR Range | 20-20kHz (IEC60318-4, -3dB) |
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Specification
[/th][th]Details
[/th]Frequency Response
Note: The following measurements were taken with my KB501X soft ear Pinna and a 711 clone coupler. They are available on my measurement database here.Let’s start with the FR and the channel matching using the Silicon tips:
I highlighted 2 areas on this initial FR, the extra bass ’tuck’ (1) and that 15K peak (2).
Now the difference with the Foam tips and the Silicon ones:
You can see the Foam tips mostly low the extreme peak but also change other areas of the treble. Whether this will work better for you will be very subjective, my suggestion is to give it a go you might not hear that peak as a peak and the foam might introduce a peak that you can hear in a different area.
I noticed that smaller foam has less of a seal and therefore lowered a bass a little:
And I tried slightly longer third party ‘red’ foam tips also:
For a bit of fun I also tried a triple flange (which typically works better for those with long ear canals)
This again changed the treble considerable but didn’t have the same peak as the silicon eartips.
I had received a pre-production pair so it was also interesting to compare the differences between these and what was “changed” for the production version:
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Silicon
[/th][th]Foam
[/th]Finally, I measured the 5 Ohm and the 10 Ohm (from the Zero Red) to see the difference in Bass:
Comparisons
First lets compare with the KE4 and the Truthear Zero Red:
The Zero Red has less bass (1) (at least without the 10 Ohm Adapter), but the 5 Ohm adapter from the Blue 2 on the Zero Red might actually be a nice option, and you can see that lack of a mid-bass ’tuck’ with JM-1 tuned IEMs like the Kiwiears KE4 and finally i highlight that the even with the Foam tips there might be a little bit too much pinna gain (3).
Adding the Aful Explorer and the silicon tips :
I highlight the different in mid-bass tuning (1) and especially the different in the pinna / presence region (2) and that 15K treble peak (3).
Finally comparing with some recent Harman tuned IEMs that I like:
Distortion Measurements
The Zero Blue 2 (like the Red) show incredible low distortion ( and much improved over the original Blue ):
Showing these distortion as a percentage you can again see the treble distortion but its is less than 0.5% so nothing to worry about:
An alternative ‘pairing’ option
So, one extra thing I thought might be useful is I did play with some EQ for the Zero Blue 2, and specifically I tried it out walking with FiiO UTWS5 (2025 edition) and I liked how this combination worked forcomfort and for those who want to keep using the silicon tips and tweak the sound using EQ:
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Rating
I have given the Truthear Zero Blue 2 a 4-star Pragmatic Rating. It offers a lot of improvements over the previous generation of Truthear Zero’s at effectively the same price (given inflation and tariff increases):- Much better internal design, improving both the bass and treble especially
- A much smaller nozzle, improving fit over the oversized original
- A significantly upgraded cable
- An optional microphone cable
- A 5Ω adapter, which slightly increases bass presence for those who prefer a warmer tuning
Here is a breakdown of my opinions:
- Build Quality:
(Durable and a great cable so good improvements over the original) - Comfort: ☆ (Smaller nozzle improves fit, but tip selection may be critical)
- Sound: (Balanced Harman tuning with great detail )
- Value: ($65 is an outstanding price for this performance)
Conclusion
The Truthear Zero Blue 2 takes an already excellent budget IEM and makes meaningful improvements. The better cable, smaller nozzle, and added tuning flexibility make it a clear upgrade over the original Truthear, but you if you are fan of Harman tuned IEMS you might still prefer the Truthear Red tuning slightly over than the Truthear Blue 2, it is all in the “technicalities”.But for just $65 (or $70 with a mic), this is a no-brainer recommendation for those seeking top-tier tuning at an affordable priceand a great option to add to your collection.
Attachments
Howdy Head-fi, I received a review copy of the Truthear X Crinacle Zero Blue 2 in the mail a few days ago and I wanted to share my thoughts. Let's talk about the good, the bad, the adapter, and the many changes Blue 2 brings to the Truthear Zero line.
**How does it look?**
Compared to the shimmery waves of the original Zero Blue, the faceplate of the Blue 2 has a bolder, more textured design reminiscent of petals or leaves. The refresh is a welcome one as I find the sharper relief of the pattern on the Blue 2 a much more eye-catching and aesthetically appealing design. The shape of the faceplace itself is virtually unchanged while the nozzle diameter has shrunk from 6.8mm to 6.2mm, along with about a 5mm reduction in nozzle length. I tried to illustrate the differences in the album.
They paired it with the most widely praised Truthear cable to date, the double helix 2-core design. It's similar to the cable that comes with the Truthear Gate, except here we have a straight 3.5mm termination rather than the right angled one. This is likely to accommodate use of the bass adapter and I personally prefer a straight termination if I'm using a dongle DAC with my phone. The simple black contrasts nicely with the Blue/Purple iridescence of the shell, and keeps true to the Truthear formula of providing a simple, handsome cable.
**How does it feel?**
Honestly? Better. Much Better. The original Zero Blue/Red's Achilles heel has always been its fit and comfort, and the extreme chonk of the original nozzle has been massively reduced for Blue 2. Many have said a 0.6mm reduction in nozzle size hardly seems like a significant difference, but this fails to account for the reduced nozzle length. That length reduction creates a more shallow fit that still feels comfortable, secure, and wont stretch out your ear canals like the original. I feel this is a massively overlooked aspect of the redesign.
The cable has a matte finish and minimal memory. It seems to be the least tangle prone Truthear cable to date, so I understand why they included it. The earhooks are comfortably shaped and hug the back of my ears well for a secure fit. The chin cinch works as expected, and I experienced virtually no microphonic interference.
**How does it sound?**
The important part. I'd like to start by saying that this is the most tip-dependent set of in ear monitors I've ever encountered. I'm a flat-head by nature so the Harman tuning is just a bit too much "fun" for me in general. I like a vocal-forward or soft v-shaped sound signature normally, and I can do a little bass boost sometimes, but I need a comfortably extended treble to accompany any tuning. This was not what I found in my first impression of the Zero Blue 2.
I used the stock silicone tips with no bass adapter for my first listen. I stepped into the Harman immersion of it all (I get why you like it Harman fans, it's just a lot), and I found a set that excelled at a tuning that's not for me. Excellent sub bass and treble extension that improves upon the original, a dynamic and wide soundstage, and clarity undiminished by it's sub bass thanks to the dual DD configuration. I was enjoying the set, I thought it has good noteweight for its price range along with a decent resistance to sibilance. Then I put it to "the test".
I'm fairly treble sensitive (hence flathead status), so I like to try out my worst case scenario by playing "Looking for Somebody (To Love)" by The 1975 as a testing track. Check it out, seriously. If I can play that song without tearing the set off my head then I know I'll be safe, the IEM wont be able to hurt me. I pushed play and crossed my fingers. It did not pass the test. To be fair, I haven't met a Harman tuning that's passed that test yet. But I decided to to tip-roll to see if we could make the sound a bit more comfortable. Truthear not-so-subtly implies that you should use foam tips by giving you a whole bunch of them, so I swapped tips and went in for round 2.
Huge difference. I was able to make it through the entire song without feeling like I was going to die at any moment. The next day I saw the release video Crinacle made about the Blue 2 and it started to make even more sense. The set was specifically tuned with foam tips in mind to deaden the more troublesome high frequencies, with silicone provided for those that like a spicy time. With the troublesome treble tamed, I enjoyed a nice, Harman-y experience. I was asked to test out how the set takes to EQ, and honestly that's a major strength. The sub bass and treble extention combined with the driver configuration allow the set to essentially transform into any flavor you like. I auto-eq'd my set to the original Zero Red target, and I found better noteweight and extension (both sides) on the Blue 2 while A/B testing, along with a more dynamic, less "flat" soundstage. Then I remembered the 5 ohm bass adapter. **Lets adapt.** How much of a difference does a little 5 ohm impedance bump make? A whole hell of a lot actually. I'm going to link to Super Review's Squig here to give you an idea: [https://squig.link/?share=Harman\_A...r_Zero_Blue_2_foam,Truthear_Zero_Blue_2_5ohm) As you can see, we get a HUGE bass boost in the balance of this IEM, running into the mid range and smoothing out the treble. If you add foam tips into the equation, what you get is a bassy, new meta-like sound with a much fuller mid bass and lower mid range, making for much richer male vocals while eliminating Harman shout and spice. Once adapted, the set has a much more pronounced mid bass kick and texture, and will satisfy a fair amount of bassheads. However I got a bit cocky and grabbed my 10ohm adapter from the Zero Red to try out. Don't do that. It made everything muddy and boomy. This thing is super sensitive to impedance changes so use a clean, audiophile grade DAC with <1ohm of added impedance if you're thinking about getting one. And if you're reading this you might already have one. I used a Jcally JM6 Pro for testing. All in all, the adapter makes it sound like a completely different IEM, and that makes for a pretty versatile, choose-your-own-adventure style experience.
**Final thoughts.**
**Who should buy this set?** Harman fans. It has great extension on both sides of its FR and technical capabilities that punch above weight. However, foam tips are required for those with treble sensitivity. With the adapter plugged it, bassheads are going to like the much warmer sound and textured low-end. And anyone that liked the original Blue should love Blue 2 and its added versatility.
**Who should avoid it?** Those that don't want to use foam tips, or don't want to adapt their way to a basshead set, and those that will not/ can not EQ. Pure flatheads wont find a native tuning to their liking, and neither will those that prefer a brighter balance. You’re getting a warm IEM with the Blue 2, any way you slice it.
The Zero Blue 2 is a nice improvement over the original that essentially makes the first obsolete. That's what we like to see in a second generation. And while I do think the Blue 2 is a very fun addition to my collection, I'll be waiting for the Zero Red 2 to satisfy my stock-flathead desires. Thanks for reading .
Edit 3/11/25- Star score reflects value to the target market. In this instance: Harman lovers that dig foam eartips.
Non-affiliate link to the set at Shenzhen Audio:
https://shenzhenaudio.com/products/...lmoPb3WIxTL9IuyKQq6XRwbMMbbv_DDAbYqQ37iGcwHdV
**How does it look?**
Compared to the shimmery waves of the original Zero Blue, the faceplate of the Blue 2 has a bolder, more textured design reminiscent of petals or leaves. The refresh is a welcome one as I find the sharper relief of the pattern on the Blue 2 a much more eye-catching and aesthetically appealing design. The shape of the faceplace itself is virtually unchanged while the nozzle diameter has shrunk from 6.8mm to 6.2mm, along with about a 5mm reduction in nozzle length. I tried to illustrate the differences in the album.
They paired it with the most widely praised Truthear cable to date, the double helix 2-core design. It's similar to the cable that comes with the Truthear Gate, except here we have a straight 3.5mm termination rather than the right angled one. This is likely to accommodate use of the bass adapter and I personally prefer a straight termination if I'm using a dongle DAC with my phone. The simple black contrasts nicely with the Blue/Purple iridescence of the shell, and keeps true to the Truthear formula of providing a simple, handsome cable.
**How does it feel?**
Honestly? Better. Much Better. The original Zero Blue/Red's Achilles heel has always been its fit and comfort, and the extreme chonk of the original nozzle has been massively reduced for Blue 2. Many have said a 0.6mm reduction in nozzle size hardly seems like a significant difference, but this fails to account for the reduced nozzle length. That length reduction creates a more shallow fit that still feels comfortable, secure, and wont stretch out your ear canals like the original. I feel this is a massively overlooked aspect of the redesign.
The cable has a matte finish and minimal memory. It seems to be the least tangle prone Truthear cable to date, so I understand why they included it. The earhooks are comfortably shaped and hug the back of my ears well for a secure fit. The chin cinch works as expected, and I experienced virtually no microphonic interference.
**How does it sound?**
The important part. I'd like to start by saying that this is the most tip-dependent set of in ear monitors I've ever encountered. I'm a flat-head by nature so the Harman tuning is just a bit too much "fun" for me in general. I like a vocal-forward or soft v-shaped sound signature normally, and I can do a little bass boost sometimes, but I need a comfortably extended treble to accompany any tuning. This was not what I found in my first impression of the Zero Blue 2.
I used the stock silicone tips with no bass adapter for my first listen. I stepped into the Harman immersion of it all (I get why you like it Harman fans, it's just a lot), and I found a set that excelled at a tuning that's not for me. Excellent sub bass and treble extension that improves upon the original, a dynamic and wide soundstage, and clarity undiminished by it's sub bass thanks to the dual DD configuration. I was enjoying the set, I thought it has good noteweight for its price range along with a decent resistance to sibilance. Then I put it to "the test".
I'm fairly treble sensitive (hence flathead status), so I like to try out my worst case scenario by playing "Looking for Somebody (To Love)" by The 1975 as a testing track. Check it out, seriously. If I can play that song without tearing the set off my head then I know I'll be safe, the IEM wont be able to hurt me. I pushed play and crossed my fingers. It did not pass the test. To be fair, I haven't met a Harman tuning that's passed that test yet. But I decided to to tip-roll to see if we could make the sound a bit more comfortable. Truthear not-so-subtly implies that you should use foam tips by giving you a whole bunch of them, so I swapped tips and went in for round 2.
Huge difference. I was able to make it through the entire song without feeling like I was going to die at any moment. The next day I saw the release video Crinacle made about the Blue 2 and it started to make even more sense. The set was specifically tuned with foam tips in mind to deaden the more troublesome high frequencies, with silicone provided for those that like a spicy time. With the troublesome treble tamed, I enjoyed a nice, Harman-y experience. I was asked to test out how the set takes to EQ, and honestly that's a major strength. The sub bass and treble extention combined with the driver configuration allow the set to essentially transform into any flavor you like. I auto-eq'd my set to the original Zero Red target, and I found better noteweight and extension (both sides) on the Blue 2 while A/B testing, along with a more dynamic, less "flat" soundstage. Then I remembered the 5 ohm bass adapter. **Lets adapt.** How much of a difference does a little 5 ohm impedance bump make? A whole hell of a lot actually. I'm going to link to Super Review's Squig here to give you an idea: [https://squig.link/?share=Harman\_A...r_Zero_Blue_2_foam,Truthear_Zero_Blue_2_5ohm) As you can see, we get a HUGE bass boost in the balance of this IEM, running into the mid range and smoothing out the treble. If you add foam tips into the equation, what you get is a bassy, new meta-like sound with a much fuller mid bass and lower mid range, making for much richer male vocals while eliminating Harman shout and spice. Once adapted, the set has a much more pronounced mid bass kick and texture, and will satisfy a fair amount of bassheads. However I got a bit cocky and grabbed my 10ohm adapter from the Zero Red to try out. Don't do that. It made everything muddy and boomy. This thing is super sensitive to impedance changes so use a clean, audiophile grade DAC with <1ohm of added impedance if you're thinking about getting one. And if you're reading this you might already have one. I used a Jcally JM6 Pro for testing. All in all, the adapter makes it sound like a completely different IEM, and that makes for a pretty versatile, choose-your-own-adventure style experience.
**Final thoughts.**
**Who should buy this set?** Harman fans. It has great extension on both sides of its FR and technical capabilities that punch above weight. However, foam tips are required for those with treble sensitivity. With the adapter plugged it, bassheads are going to like the much warmer sound and textured low-end. And anyone that liked the original Blue should love Blue 2 and its added versatility.
**Who should avoid it?** Those that don't want to use foam tips, or don't want to adapt their way to a basshead set, and those that will not/ can not EQ. Pure flatheads wont find a native tuning to their liking, and neither will those that prefer a brighter balance. You’re getting a warm IEM with the Blue 2, any way you slice it.
The Zero Blue 2 is a nice improvement over the original that essentially makes the first obsolete. That's what we like to see in a second generation. And while I do think the Blue 2 is a very fun addition to my collection, I'll be waiting for the Zero Red 2 to satisfy my stock-flathead desires. Thanks for reading .
Edit 3/11/25- Star score reflects value to the target market. In this instance: Harman lovers that dig foam eartips.
Non-affiliate link to the set at Shenzhen Audio:
https://shenzhenaudio.com/products/...lmoPb3WIxTL9IuyKQq6XRwbMMbbv_DDAbYqQ37iGcwHdV
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