Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
All
A18s
reviews

Manufacturer details
- Driver Type/Count: Eighteen precision balanced armature drivers
- Driver Configuration: 1 tia high, 1 high-mid, 8 mid, 8 low
- Frequency Response: 10Hz – 20kHz
- Sensitivity: 106 dB/mW @ 1kHz @ 1mW (84mV)
- Impedance: 8Ω Nominal
- Crossover: Integrated 4-way passive crossover
- Isolation: -20dB w/ m20 module, -15dB w/ m15 module
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- 64 Audio utilizes a unique "tia" (tubeless in-ear audio) system, which eliminates traditional tubes and dampers in favor of open balanced armature drivers set within custom-designed acoustic chambers, with a single bore nozzle to maximize coherence and minimize resonances.
- They implement "Apex" technology across their IEM lines, a pneumatically controlled venting system using swappable modules designed to alleviate pressure in the ear canal, thereby reducing listening fatigue, in addition to subtly modifying the low-end response.
- 64 Audio offers a fully computerized CIEM manufacturing process, utilizing digital ear mold scanning, software trimming, and 3D printing which significantly reduces turnaround time, allows for precise fits, and retains customer ear mold data for future purchases.
- The brand distinguishes itself by designing IEMs to maintain a consistent sound signature regardless of the source device's output impedance through its proprietary "LID" (Linear Impedance Design) tech.
Select products
Aspire Series
- Positioning: A practical entry-level line designed for live performance use.
- Description: Offers reliable, straightforward performance with a focus on robustness and comfort for stage monitoring. Compared to higher-tier models like the U4s and U6t, it delivers essential functionality for small rooms and tight budgets without extra driver complexity.
U4s
- Positioning: A balanced model offering a simple 4-driver setup for clear, accessible sound.
- Description: Provides clear mids and highs through a TIA high driver paired with balanced armature lows for straightforward performance. Compared to the Aspire Series and U6t, it offers a middle ground in cost and technical refinement.
U6t
- Positioning: A mid-tier design focused on delivering dynamic musical reproduction with subtle added color.
- Description: Features a neutral tuning base with slight tonal enhancements and a more refined driver layout than the U4s. Compared to the Aspire Series and U4s, it caters to users seeking improved sonic detail and versatility without a significant price jump.
Nio
- Positioning: A high-end option engineered with an advanced 8-driver configuration for richer sound.
- Description: Delivers smoother treble and fuller mids through its combination of one TIA high driver, a balanced armature high-mid, multiple mid drivers, and a dynamic low, ensuring organic sound quality. Compared to the U6t and U4s, it targets users with higher budgets seeking versatile performance.
Fourte
- Positioning: A flagship model showcasing groundbreaking in-ear design with premium materials.
- Description: Stands out with an advanced tubeless design and superior TIA technology that delivers exceptional clarity and dynamic range through multiple drivers. In contrast to the Nio and other lower-tier products, it represents state-of-the-art performance and refined functionality for high-resolution, critical listening scenarios.
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Used
64 Audio
What if you spend more?
Product Strengths
- Build quality is sensational, handmade in Taiwan, and has thousands of man hours put into it
- The kit has detachable clickable connections, and high-quality pure copper cables
- Comes with accessories such as replacement parts for the earbuds, and adapters (3.5, 4.4 for balance, and 2.5 balance)
- Accessories are beautifully made with wood and good hinges
- The product features a two-way speaker system inside an earbud
Product Considerations
- It demands good, abundant power to be driven, due to its specifications of 93dB sensitivity, and 182 Ohms
- Needs to be burned-in (driven) for no less than 200 hours, and most possibly 300 hours
- The stock cable has tiny connectors which make it very difficult to connect any wire beyond 26-28awg
- The outer packaging box seems to be a reformed cardboard box, which is huge and white, and may not be durable in the long run
- The proprietary MMCX-designed connectors means the cable’s tiny connectors make it very difficult to connect any wire beyond 26-28awg and perhaps a very thin 2 or 4 wire at best
Comparisons (according to reviewers)
- The oBravo RA-C-CU excels versus the Vision Ears EVE2020 across every parameter, though there is a warmth across the EVE’s midrange via its dynamic driver, that moves it to, at least, competitive with the RA-C-CU and its Neodymium Dynamic Driver
- There were no aspects between the Vision Ears ELYSIUM and the oBravo RA-C-CU where the oBravo did not excel
- The oBravo RA-C-CU extends a competitive advantage across all relevant parameters from bass extension to treble extension to transparency to a coherency that holds together through the most complex and dynamic passages to a more expansive soundstage, compared to the oBravo EAMT-2C
Takeaway: The Ra-c-cu (21.5) is a very well-made earbud that gives a sensational listening experience like high-end speakers in one's ears. If one wants to treat oneself with serious earbuds where money is not a problem, this is the way to go.
Video review
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Our summary
Product Strengths
- Considered by many as having the best sound achievable in an in-ear headphone, making it an exceptional audio experience
- The sound signature is mostly balanced with tasteful coloration, where the treble imparts a particular element that is potentially preferable
- The midrange is extremely well done
- Features unique SLAM subwoofer, woofer, midwoofer, mid tweeter, tweeter and EST technologies
- Built with Grade 5 titanium, providing sturdiness and high quality
Product Considerations
- Treble performance can be hit or miss depending on the listener's anatomy and HRTF
- Requires more power than typical IEMs, potentially draining the battery of portable audio players
- Shells are on the larger side
- The included cable is nice, but the chin cinch tends to slide down
Comparisons (according to reviewers)
- Compared to the Hi-Senior Megafest and Dusk Default DSP, the Storm is an editorialized or enhanced version of those IEMs, particularly regarding bass and mids
- Compared to the 64 Audio U6T, it has similar balance with similar tasteful colorations, but Storm's bass is more punchy and the upper treble is more to the reviewer's preference
- Compared to the Empire Ears Odin, the Storm is preferred because the Odin is not as versatile, and the Storm sounds more detailed
- Compared to the Empire Ears Raven, the Storm is more normal in a good way because the Raven has massive bass and a strange lower midrange resonance feature
- Resolution, stage and tonality are better on the Storm compared to Grand Maestro
Takeaway: The Storm is a high-end IEM with exceptional sound quality and great build, even if pricey. It could be worth buying for those who want the best possible audio experience and appreciate a balanced sound with unique features.
Video review
Our take on the brand
Video review
Our take on the brand
Product Strengths
- Fuller body smooth analog tonality and a neutrally balanced sound signature
- Naturally resolving treble
- Expanded soundstage
- Beautiful, exotic material shells and premium leather accessories
- Very light weight
Product Considerations
- The high price is a significant consideration
- Performance is source pair-up dependent
- The included PWA First Times Shielding Pro cable has some microphonics
- Shells are a little bigger in comparison to previous Mason FS models and MM/AP models from Mentor-series
Comparisons (according to reviewers)
- Vs Unique Melody Amber Pearl, the Soleil Tombé has less bass and is more neutral, allowing for clearer mids compared to the Amber Pearl's stronger bass presence
- Vs U12T, the Mason FS has better bass impact and texture, while the Mason FS also presents vocals as warmer and fuller, with more atmosphere, while the U12T presents a very clean and clear sound, though it is less energetic
- Vs Noble Onyx, the Mason FS is warmer, while the Onyx has a larger, more open sound, though the Onyx can be clearer in higher registers but loses clarity in lower registers compared to Mason FS
- Vs UM Mason FS Le Jardin (LJ), the 2024 model is just $499 more
Takeaway: The Mason FS Soleil Tombé is a very good-looking IEM that provides a unique listening experience with balanced sound and beautiful mids. It is for people that want something different than other products in the market.
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Excellent technical performance, resolving details previously unnoticed
- Great soundstage with realistic and immersive holographic presentation
- Comfortable shell geometry and fit, with Apex modules preventing pressure build-up
- Includes a premium 8-core braided silver cable
- Reference-level tuning that's balanced overall and enjoyable for day-to-day listening
Product Considerations
- Price is quite high
- The U18s can sound a bit dark for some listeners because of its treble presentation
- Treble can be 'zingy' or fatiguing to some
- Midrange presentation can be distant or dull
Comparisons (according to reviewers)
- Compared to the U6t, the U18s is a more advanced version with better resolution and nuance, especially in the lower octaves and backing notes, as well as better balance in the mids
- The U18S is a darker, more relaxed U12T
Takeaway: The 64 Audio U18s is a high-end IEM that offers excellent technical performance and a balanced, enjoyable sound. With its comfortable design and immersive soundstage, it is great for audiophiles who want a reference-level listening experience.
Video review
Our take on the brand
Our Summary
Product Strengths
- Excellent technical performance and detail retrieval, considered several cuts above other IEMs
- Outstanding imaging performance, with precise soundstage and instrument separation
- The bass response is a highlight, delivering a punchy sub-bass with texture and articulation
- Offers a warmer tonal balance that is easy to get into with a mostly 'neutral' sound
- Bone conduction enhances low-frequency extension, reverb, and detail
Product Considerations
- Large chassis that may be uncomfortable for some users, particularly those with smaller ears
- The subdued treble range may not provide enough energy and sparkle for some listeners
- Stock cable is lackluster in terms of usability due to its plasticky feel, rigidity, and microphonic feedback
- Driver flex (a harmless crinkling sound upon insertion) is present
Comparisons (according to reviewers)
- Legend Evo delivers a stronger bass impact, depth, and extension than the Legend X
- Legend Evo produces better constructed highs than the Legend X
- Legend Evo shows better clarity than the Legend X, and has more detail
- The Legend X can sound veiled concerning the Legend Evo
- The Legend Evo feels a touch smoother than the Empire Ears ODIN
Takeaway: The Legend Evo is a top-tier IEM with innovative bone conduction technology that creates a unique and immersive listening experience with enhanced bass. It is a great option for those seeking flagship-level performance with a warm, bass-focused sound signature.
Video review
Our take on the brand
Our Summary
Product Strengths
- Excellent detail retrieval, resolving with the best over-ear headphones, challenging the brain to take it all in.
- Wide soundstage with precise imaging, creating an immersive, holographic 3D image.
- Easy to drive, delivering speed and impact even with low-power sources.
- High level of craftsmanship and build quality, using premium materials like CNC-machined aluminum and Damascus steel faceplates.
- Comes with the Magnus cable, a high-quality 8-core cable constructed with graphene, monocrystalline silver, and copper-silver alloy.
Product Considerations
- Treble can become a bit hot and fatiguing over long periods, but can be mitigated by using foam ear tips.
- Bass presence is more nominal and cohesive, not dominant or overpowering like some bass-head IEMs.
- Fit may be an issue for some due to the larger-than-average size of the IEM.
- Could be fatiguing over time due to sensory overload from extreme detail.
- Some reviewers found that the upper mids/lower treble frequency range could use a little boost.
Comparisons (according to reviewers)
- Offers a stronger balance of detail, performance, and musicality, a fuller, richer midrange, and better texture and timbre, when compared to the Empire Ears Odin—Odin has stronger holographic separation, an intense sense of vocal performance, and more potential for fatigue.
Takeaway: The Noble Viking Ragnar is a top-tier IEM, offering incredible detail and a wide soundstage for an immersive listening experience. Its build quality and design are exceptional, making it a great choice for those who want some of the best IEMs in the market.
Video review
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Our Summary
Product Strengths
- Tremendous transparency, offering a wealth of microdynamics and spatial cues, critical in determining positioning and layering.
- Incredibly clear sound, yet wrapped in a warm, lush, and inviting overall picture.
- Highs are extended, detailed, and wonderfully resolved, easily able to summon the ethereal or holographic when called for.
- The soundstage is quite impressive—deep, wide, with very good headroom, and holographic when called to be so.
- The shell design is comfortable with a short nozzle, and light weight.
Product Considerations
- The treble is a little bit relaxed, and some songs may not cut through the way they need to.
- Amplifiers for this particular headphone are going to matter, and they are going to make a difference between several different amplifiers.
- The bass does not bring the rumble, nor the impact, nor does it reach to the stygian depths of the Holy-Bass-Head-Grail.
- Though the Odin provides for a comfortable fit, it can be uncomfortable for people who have really small ear holes, as the stem itself is quite wide.
- The 'Bifröst' faceplate design might be too flashy for some.
Comparisons (according to reviewers)
- Vs Empire Ears Zeus: The Odin smashes the Zeus all day, every day, for sound quality, with a better midrange and significantly nixed highs.
- Vs 64 Audio U12T: Odin is at least as good, if not better, in the mids and the bass, and has better punch and slam to the bass frequencies.
- Vs Empire Ears Legend X: The Odin is a much more balanced-tuned IEM.
- Vs 64 Audio Tia Forte: The Odin has a more agreeable frequency response.
- Vs Thieaudio Monarch: The Monarch has a really nice bass shelf, but the Odin has better technical performance and a better frequency response.
Takeaway: The Empire Ears Odin offers an easygoing listening experience and clear sound, and has tight bass response with a great midrange. It could be a great choice for those seeking a warm IEM with finesse.
Video review
Our take on the brand
Our Summary
Product Strengths
- Incredibly clear and detailed sound, offering a transparent window into the music
- Well-defined, punchy, and high-quality bass response, with good impact and rumble, without being muddy
- Smooth and well-defined treble, avoiding sibilance or harshness, and retaining excellent resolution
- Broad and deep soundstage with excellent imaging, layering, and separation of instruments
- Visually striking and beautiful Bifrost faceplate design
Product Considerations
- The fit may be uncomfortable for users with smaller ears, as the stem is quite wide and the monitors themselves are fairly large
- Upper mid-range can be forward, and at times can be borderline shouty or fatiguing in some tracks
- Treble response, while detailed, might be a little relaxed for some, not cutting through as much as some other IEMs
- Some reviewers found the build quality of the resin shell to be just okay, not feeling particularly premium or durable relative to the price
Comparisons (according to reviewers)
- Vs. 64 Audio U12T: The Odin has better punch and slam in the bass, while the U12T has a more layered and separated sound with slightly more micro-details
- Vs. Empire Ears Legend X: The Odin is much more balanced and refined compared to the bass-heavy Legend X
- Vs. Fir M5: The M5 has a more forward and clearer treble response and wider soundstage, but the Odin's midrange is more forward and produces a more enjoyable vocal response
- Vs. Empire Ears Zeus: The Odin is smoother with more bass response and a better mid range
- Vs. Vision Ears Elysium: The Elysium brings an analog-like ease to the midrange, but is not a match for the Odin in detail and transient speed
Takeaway: The Empire Ears Odin is a technically impressive IEM with a smooth, clear sound, detailed bass and a striking design. If one is seeking a high-end listening experience where details are clearly displayed in an immersive 3D stage, these could be a great match.
Video review
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