The TRUTHEAR x Crinacle ZERO RED are wired audiophile IEMs. They're an updated version of the TRUTHEAR x Crinacle ZERO, with the manufacturer claiming that these have undergone much more than a simple facelift. While they retain the same dual-driver design, changes in the voice coils and crossover circuits have resulted in a new tuning that strays from the original's mission to stay close to the 2019 IEM curve. This edition instead represents the kind of less bass-forward tuning that's preferred by Crinacle, one of the internet's most well-known IEM tuning experts. That said, for those that might miss the low-frequency oomph of the previous generation, they come with a handy 10-ohm resistor that can boost the bass response.
Our Verdict
The TRUTHEAR x Crinacle ZERO: RED are okay for sports and fitness use. They're lightweight, comfortable, and have a stable fit. They're also well-built, though they lack a certification against water or dust damage. They're primarily hampered for this use by their wired design, which is susceptible to tangles and snags. Although the cable is detachable, it can easily be yanked while in motion, which can result in damage to the connectors. They also don't have any dedicated physical controls for skipping tracks or pausing while you're mid-workout.
- Comfortable, stable fit.
Cabled design can be cumbersome.
The TRUTHEAR Crinacle ZERO: RED are decent for travel. While they're comfortable, portable, and come with a convenient carrying pouch, they struggle to isolate you against a lot of background noise, especially lower-frequency sounds, like the rumble of bus engines. They're a little better at blocking out the mid-range sounds of a busy street, but the passive isolation provided by their in-ear fit still falls flat when compared to ANC-equipped alternatives.
- Comfortable, stable fit.
- Very consistent audio delivery.
- Minimal isolation against low frequency sounds.
Cabled design can be cumbersome.
The TRUTHEAR x Crinacle ZERO: RED are disappointing for office use. Despite their comfortable, stable fit and solid build quality, they struggle to block out common office sounds, like background chit-chat and the scraping of chairs. They also don't have a mic, so you'll have to switch to a headset or use the built-in mic of your connected device to take calls (if it has one). That said, they barely leak any audio, so you won't have to worry about disturbing your colleagues even if you blast your music.
- Comfortable, stable fit.
- Minimal isolation against low frequency sounds.
No built-in microphone.
The TRUTHEAR ZERO: RED are wired-only headphones; you can't use them wirelessly.
The TRUTHEAR ZERO: RED are passable for wired gaming. Thanks to their wired design, they have virtually no latency. They also feature a comfortable in-ear fit suited to long gaming sessions. Their balanced sound profile is great for rendering bass frequency sounds, like explosions, with plenty of substance without overshadowing the detailed mid-range. Unfortunately, they don't have a mic, so you'll need an aftermarket cable or standalone mic if you need to speak to teammates.
The TRUTHEAR ZERO: RED have satisfactory audio reproduction accuracy. Their frequency response doesn't deviate from their balanced sound profile much—minor fluctuations in the treble may sharpen sibilants, depending on pitch. Their L/R drivers are fairly well-matched, but there are some mismatches in their high-treble frequency and phase response. As we're less sensitive to the top end over time, you likely won't notice serious issues in everyday listening. The earbuds produce low distortion, even at high levels, reproducing audio cleanly. As in-ear headphones, they don't interact with your outer ear to improve immersion.
The TRUTHEAR ZERO: RED have alright noise isolation performance. Their foam tips do a decent job passively attenuating treble range noise; however, the earbuds' lack of ANC doesn't supplement the virtually nonexistent mitigation in the bass and mids. In everyday use, they won't do much against bus or plane engines while traveling, nor footsteps in the office. On the plus side, the earbuds don't leak much audio, rarely exceeding the noise floor of a quiet room.
The TRUTHEAR x Crinacle ZERO: RED don't have an integrated microphone.
The TRUTHEAR ZERO: RED's frequency response consistency is impressive. If you take the time to find the right ear tips and get a good seal, the earbuds' performance will remain consistent between reseats. Our frequency response measurements will also be indicative of most people's perceived listening experience.
Performance Usages
Changelog
- Updated Mar 24, 2026: This review has been updated to Test Bench 2.1, which removes the Group Delay test, and rebalances scoring for the Harmonic Distortion test and Audio Reproduction Accuracy performance usage. For more details, consult our full changelog.
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Updated Nov 18, 2025:
The Build Quality section was updated to compare the CrinEar Daybreak.
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Updated Jul 29, 2025:
We've updated the Sound Profile box with a link to a downloadable folder of EQ settings that will help you match these headphones' frequency response to different target curves available in our Graph Tool.
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Updated Apr 25, 2025:
This review has been updated to Test Bench 2.0, which adds the following tests: Stereo Mismatch, Group Delay, Cumulative Spectral Decay, PRTF, Harmonic Distortion, and Electrical Aspects. We've added new performance usages and updated the text throughout the Sound tests and side-by-sides.
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Differences Between Sizes And Variants
The TRUTHEAR x Crinacle ZERO RED are wired IEMs designed to deliver audiophile-quality sound. Not to be confused with the original TRUTHEAR x Crinacle ZERO, these buds come in one color variant: 'Red.' The two variants boast an almost identical feature set, with the main point of differentiation being the tuning. You can read more about this in Sound Profile.
If you encounter another variant of these headphones, please let us know in the comments below, and we'll update our review.
Popular Headphones Comparisons
The TRUTHEAR ZERO: RED are wired IEMs. They're a re-tuned version of the TRUTHEAR x Crinacle ZERO, so comparing them to the original version is natural. The 'RED' features a tuning that's less focused on following the Harman 2019 IEM target curve and developed instead with Crinacle's own listening preferences in mind. As a result, the new version reins in the original's buoyant, in-your-face bass response and replaces it with something more balanced. The treble range is also more veiled. Besides a change in the color and design of the decorative panel and the inclusion of the 10-ohm resistor, there are no other differences in features. Those with a bigger budget who desire a more prominent treble response might also want to consider the MOONDROP Blessing 3, although they're considerably more expensive.
If you're looking for more headphones, check out our recommendations for the best audiophile headphones, the best headphones for music, and the best wired headphones.
The TRUTHEAR x Crinacle ZERO: RED are a better choice for fans of bass-heavy genres than the TRUTHEAR HEXA, which lacks a little body in their low end. On the other hand, Jazz fans may appreciate the slightly more detailed treble of the HEXA. The RED are a bit cheaper than the HEXA, but the HEXA are slightly better at blocking out noise, though neither pair have ANC.
The MOONDROP Aria and the TRUTHEAR x Crinacle ZERO: RED are similarly priced wired audiophile IEMs. While the MOONDROP are more comfortable and deliver audio more consistently, the TRUTHEAR do a better job of blocking out external sound across the entire frequency range, though neither is particularly exceptional at noise isolation.
The TRUTHEAR x Crinacle ZERO: RED and the TRUTHEAR x Crinacle ZERO are, by and large, the same pair of IEMs, albeit with different tunings and a slight difference in noise isolation performance. They're both comfortable, well-built, and stable-fitting, but the RED variant aligns more closely with our target curve, with a more controlled bass in particular. They're also better at isolating mid-range frequencies, like the chatter of your colleagues in an office setting. On the other hand, the RED have a recessed treble that will be less appealing to people who like a more excited sound with a bit more sizzle. It's worth noting that the RED variant comes with a 10-ohm impedance adjustor, so you can always purchase this variant and use the adjustor if you prefer a more bass-heavy sound.
The MOONDROP x Crinacle DUSK and the TRUTHEAR x Crinacle ZERO: RED target different kinds of users. The MOONDROP are priced for premium listeners who are willing to pay extra for perks like their DSP cable that allows you to apply presets to their sound. On the other hand, the TRUTHEAR perform very well for their price and have a more detailed treble range than the MOONDROP. Fans of sizzle and bite might find the MOONDROP's subdued presentation a little boring. However, both pairs will suit listeners who prefer a smoother top end.
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Test Results
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