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
408H Skyline
reviews

Manufacturer details
- Driver Configuration: 2x 9.7mm PET diaphragm dynamic drivers + 6x balanced armature drivers
- Frequency Response: 20Hz to 20KHz
- Impedance: 8 Ohms @ 1KHz, 0.5Vrms
- Connector: 0.78mm brass gold-plated 2 pin
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:
Select products
S100 Cappuccino UIEM
- Position: The entry-level line designed for affordability and efficient performance with low-powered sources.
- Description: Features a 10mm dynamic driver with a liquid crystal polymer diaphragm and a double harmonic acoustic chamber, offering reliable sound reproduction from mobile and compact devices. Compared to higher-priced models like the Nautilus or GT600, it has a simpler design and fewer driver innovations, making it ideal for users on a budget with modest space and functionality needs.
Nautilus
- Position: The mid-range model combining artistic design with innovative acoustic technology.
- Description: Offers a gold-plated brass shell with mother-of-pearl inlays and an advanced driver setup that blends planar, dynamic, and bone conduction drivers to deliver balanced sound. Unlike the entry-level S100 that uses a single dynamic driver, it incorporates more complex acoustic drivers and design details, yet remains less technically intricate than flagship models like the GT600 or Alpha Ti.
Impulse Ti
- Position: The high-performance IEM crafted for detailed and immersive audio experiences.
- Description: Integrates dual dynamic drivers with custom titanium diaphragms, six balanced armature drivers, and a ceramic piezoelectric driver to achieve precise bass control and clarity. In comparison to the simpler Nautilus and S100, its enhanced driver combination offers improved accuracy, while its setup is less elaborate than the flagship GT600 and Alpha Ti.
GT600 Gran Tourer UIEM
- Position: The flagship premium model with a robust 12-driver electro-acoustic design inspired by motorsport.
- Description: Uses a mix of electrostatic, balanced armature, and Tesla-powered dynamic drivers housed in a forged carbon fiber shell to deliver a dynamic and spacious sound signature. While it boasts more advanced materials and a higher driver count than the Impulse Ti or Nautilus, its complexity positions it just below the ultra-premium Alpha Ti.
Alpha Ti LE UIEM
- Position: The ultra-premium model defined by its 3D printed titanium construction and meticulous craftsmanship.
- Description: Uses selective laser melting to produce a medical-grade titanium shell with a polished mirror finish, paired with a sophisticated driver configuration that includes Foster dynamic drivers, balanced armatures, and a multi-layer ceramic piezo driver for full spectrum performance. Compared to all other models—from the S100 and Nautilus through to the Impulse Ti and GT600—it delivers the highest level of technological sophistication and build quality.
Our take on the brand
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Used
Jomo Audio
What if you spend more?
Our summary
Product Strengths
- Bold yet meticulously controlled bass
- Excellent treble fine detail retrieval
- Powerful and clear midrange
- Top class soundstage expansion
- Comfortable and visually charming shells
Product Considerations
- Lacks separation
- The mid-bass tuning is somewhat tubby
- Not the most genre versatile tonality
- The treble can have some emphasis on 'S sounds', and cymbals may get a little shiny, shimmery, and somewhat sizzly
- The IEM is on the larger side and may not fit those with small ears well
Comparisons (according to reviewers)
- Compared to Maestro SE, the Instinct Emerald has more bass energy
Takeaway: The Instinct Emerald is a creation of warmth, power, and space on top of marvelous driver and acoustic design. Its excellent sub-bass can be very engaging.
Video review
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Our summary
Video review
Our take on the brand
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
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Impressive technical performance, clarity, detail retrieval, and resolution due to its planar magnetic drivers.
- Features a new, comfortable, and ergonomic shell design that's also lightweight and durable.
- Includes two upgraded Time Stream Metal cables, providing both 3.5mm and 4.4mm terminations.
- Delivers a strong, extended bass response, with texture and speed, plus a nimble, airy top-end.
- Exhibits a spacious, wide, and holographic soundstage with good imaging and instrument separation.
Product Considerations
- Lower sensitivity might require a dedicated DAP or amplifier for optimal performance, and can sound anemic when paired with just a phone.
- Can be sensitive to source pairings, warmer DACs might wash out the mids and some pairings may bring out sibilance.
- Stock tips might not provide the best seal for everyone, and the stock tip selection is poor.
- Silicone eartips can make the treble sound harsh.
- The mirror-finished stainless steel faceplate is prone to fingerprints and smudges.
Comparisons (according to reviewers)
- Vs. Campfire Audio Bonneville: Astrolith has superior mids, clarity, detail and transparency, and better treble extension, articulation, and overall resolution.
- Vs 64 Audio Volür: Astrolith offers bigger bass and a more exciting presentation, as well as faster and more resolving sound, but Volür is more accurate overall.
- Vs. Oriolus Monachaa: Astrolith has a faster and more controlled bass with better texture, a more natural and realistic midrange with a fabulous timbre.
- Vs. Elysian Acoustic Labs Annihilator: Astrolith delivers a more robust and organic mid-range with realistic and natural timbre and more defined lower mids.
Takeaway: The Astrolith is a technically impressive IEM with a comfortable design that delivers a powerful and detailed sound. It could be a great pick for listeners who want high-end sound that can play all kinds of music well.
Video review
Our take on the brand
Our Summary
Product Strengths
- Captures the sound of the original Svanar, with a balanced tuning emphasizing bass and treble while maintaining the mids
- Incredible imaging performance, offering a wide, well-rounded, three-dimensional soundstage with excellent positioning and separation—highly competitive, even compared to non-TWS IEMs under $1000
- Has an R2R DAC which permits unreachable technical performance
- Very light and comfortable
- Excellent connectivity and usability
Product Considerations
- LDAC connectivity issues with invasive intermittence and noise cutting
- ANC and Transparency mode aren’t very useful and lack dynamic, delivering leaner dynamic, less musicality
- Plastic build might not be most durable if dropped
- High-frequencies are quite sensible to the source, making it one of the least forgiving TWS
- Hiss is also present
Comparisons (according to reviewers)
- The Svanar Wireless is punchier, with better bass detail and imaging, and a wider soundstage, while the Final ZE8000 has a warmer, more neutral sound
- The Svanar Wireless has stronger imaging performance, a wider soundstage, and a better balance between separation and cohesion
- The Svanar Wireless is superior in technicalities and tonal balance, as well as timbre and tone naturalness, and ultimately musicality
- The Svanar Wireless' soundstage is taller and wider but not as deep, since clarity isn’t as sharp and clean, silence being more "noisy"
- The Svanar Wireless has better sound and performs better technically
- The Sony TWS has bloated bass that overwhelms everything else; in comparison, the soundstage and treble performance of the Svanar Wireless is miles ahead, presenting a much more detailed, natural, and sophisticated kind of sound
Takeaway: The Svanar Wireless sounds impressive for wireless earbuds, and it has great connectivity and features. For those seeking high-end wireless sound, these are worth considering.
Video review
Our take on the brand
Our Summary
Product Strengths
- Praised for its beautiful design
- Very comfortable, almost expected from an IEM based on resin
- Easy to drive due to its low impedance and high sensitivity
- Provides a lot of clarity
- Has a very natural tonality, even with balanced drivers
Product Considerations
- Its design might be too fragile and prone to scratches
- May lack impact and slam for music with a lot of low-octave focus
- Some amplifiers might not synergize well, needing experimentation
Comparisons (according to reviewers)
- Compared to the Moondrop variations, the Cadenza is preferred for its handling of transitions
Takeaway: The Cadenza is a beautiful IEM with great clarity that's also comfortable to wear. It is an easy to drive IEM, with great potential to provide enjoyable listening sessions.
Video review
Our take on the brand
Our Summary
Product Strengths
- Versatile sound signature, going from bassy to neutral with the use of included tuning modules
- Excellent bass response with a dynamic driver, providing strong texture, deep extension, and impact
- Very good treble extension, air, and sparkle for detail retrieval without harshness
- Expertly captures the 64 Audio character of balancing pro audio sensibilities and a more audiophile-friendly sound
- Comfortable and durable design, with a lightweight anodized aluminum shell and well-thought-out accessories
Product Considerations
- Imaging and instrument separation are decent, but not standout for the price range
- Mid-range may sound a bit thin to some, with a more relaxed upper mid-range that results in vocals being a little bit on the husky side
- The nozzle doesn’t have lip holder and is a bit problematic
- Isolation isn't exceptional due to the apex module
Comparisons (according to reviewers)
- Vs 64 Audio Neo: U4S is preferred due to the U4S being the cheaper IEM
- Vs Thieaudio Monarch MkII: The Monarch is comparatively lean sounding
- Vs 64 Audio U6T: U6T is a little more neutral overall with a stronger technicality, but the U4S injects a little more fun into the sound
- Vs Campfire Audio Andromeda Emerald Sea: The U4S offers a more natural mid-range presentation
- Vs 64 Audio Nio: The U4s effectively undercuts the Nio by a third of the price with comparable sound quality
- Vs Custom Art Fibae 5: If you want technicalities and details, Fibae 5 is superior, if you want a very capable yet slightly musical and mainstream IEM, opt for the U4s
Takeaway:
The 64 Audio U4s is a well-rounded IEM that offers a fun and engaging sound signature with the ability to customize the bass response. With its comfortable fit and excellent build quality, it's a great option for those looking for a versatile and enjoyable listening experience.
Video review
Our take on the brand
Our Summary
Product Strengths
- Great build quality and design with eye-catching faceplates
- Listeners can enjoy the versatile sound signature, suitable for all-rounder listening preferences
- Good balance of technical performance and warm musical tonality
Product Considerations
- Bass could use a bit more texture to color the rumble
- Unvented shell design and larger-than-average nozzle size (6.2 mm)
- Stock cable is stiff and without a chin cinch
Comparisons (according to reviewers)
- Versus 64 Audio U4s, the Terra falls between the U4s warmer, lusher end of the spectrum and the Symphonium Helios' lean and bright signature
- The Terra is a better blend of technical performance as well as warmth in the musical aspect when compared to Awful Cantor
Takeaway: The Lime Ears Terra is a versatile IEM that provides a good balance of technical performance and warm, musical tonality with solid bass, mids, and excellent treble. The build quality is excellent, and they have a unique look in the marketplace.
Video review
Our take on the brand
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