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.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
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304 Boxster UIEM
reviews
Video Review
Manufacturer details
Features
Specifications
- Drivers: 4 Balanced Armatures (1 low, 2 mids, 1 high)
- Crossover: 3 ways Tripartite
- Bores: 3
- Frequency Range: 20Hz ~ 20KHz
- Impedance: 34 Ohms
Description
With the 304 Boxster, Jomo Audio (JM) manifests its best implementation in the mid-range. Capable of pulling out extremities in details and musicality in the entirety of the mid-range frequencies, the 304 Boxster succeeded in creating a lush and organic mid-centric sound signature that is suitable for vocals and acoustics enthusiasts as well as stage monitoring for vocalists and instrumentalists.
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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:
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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.
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Avg. Product Price
$501-$1,000
Used For Sale
0
Available (Scroll Down)
Brand Popularity
815
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
13
Founding Year
2015
Our take on the brand
Jomo Audio is a hifi brand that pioneered several innovative IEM technologies, including 3D-printed medical-grade titanium shells, and early electrostatic hybrid designs with micro-transformers.
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Jomo Audio
408H Skyline
1499
1499
/
2
Reviews
Jomo Audio is a hifi brand that pioneered several innovative IEM technologies, including 3D-printed medical-grade titanium shells, and early electrostatic hybrid designs with micro-transformers.
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Our summary
Video review
Our take on the brand
Jomo Audio is a hifi brand that pioneered several innovative IEM technologies, including 3D-printed medical-grade titanium shells, and early electrostatic hybrid designs with micro-transformers.
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Campfire Audio
Astrolith
2199
2199
/
13
Reviews
Campfire Audio is a hifi headphone brand known for their Tuned Acoustic Expansion Chamber (TAEC) for balanced armatures and Solid Body Design that mounts drivers into a single 3D-printed "engine block" to improve tuning and reliability. The brand has pioneered several unique approaches, such as crossoverless dual-planar architecture, beryllium-PVD dynamic diaphragms, and 3D-printed ceramic acoustic structures. Their Andromeda model long held a reputation as a benchmark reference for hifi IEM performance.
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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
Campfire Audio is a hifi headphone brand known for their Tuned Acoustic Expansion Chamber (TAEC) for balanced armatures and Solid Body Design that mounts drivers into a single 3D-printed "engine block" to improve tuning and reliability. The brand has pioneered several unique approaches, such as crossoverless dual-planar architecture, beryllium-PVD dynamic diaphragms, and 3D-printed ceramic acoustic structures. Their Andromeda model long held a reputation as a benchmark reference for hifi IEM performance.
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HIFIMAN
Svanar
1999
1999
/
13
Reviews
HIFIMAN is a hifi brand known for its planar magnetic headphones that use extremely thin diaphragms and acoustically transparent "Stealth Magnets" to reduce sound distortion. The company pioneered high-resolution portable audio players and creates electrostatic headphones that bring high-end sound quality to more accessible price points, as well as widely renowned flagship models such as the Susvara.
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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
HIFIMAN is a hifi brand known for its planar magnetic headphones that use extremely thin diaphragms and acoustically transparent "Stealth Magnets" to reduce sound distortion. The company pioneered high-resolution portable audio players and creates electrostatic headphones that bring high-end sound quality to more accessible price points, as well as widely renowned flagship models such as the Susvara.
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Letshuoer
Cadenza
1999
1999
/
13
Reviews
Letshuoer is a hifi audio brand known for democratizing planar-magnetic IEMs with their S12 model, which brought exceptional technical performance to the $150 price point. The brand sets itself apart through unconventional driver architectures like their proprietary R-Sonic passive filtering module for pressure relief and staging expansion.
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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
Letshuoer is a hifi audio brand known for democratizing planar-magnetic IEMs with their S12 model, which brought exceptional technical performance to the $150 price point. The brand sets itself apart through unconventional driver architectures like their proprietary R-Sonic passive filtering module for pressure relief and staging expansion.
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What competes at this price?
Jomo Audio
Nautilus
800
/
Released
2024
The Nautilus features a stunning gold-plated brass shell, adorned with natural mother-of-pearl inlays, exuding elegance and sophistication. Its compact size ensures a comfortable and secure fit for a wide range of ear shapes and sizes, making it ideal for prolonged listening sessions.
Jomo Audio is a hifi brand that pioneered several innovative IEM technologies, including 3D-printed medical-grade titanium shells, and early electrostatic hybrid designs with micro-transformers.
Expand Details
Our Summary
Product Strengths
- Class-topping build quality and design
- Natural yet engaging tuning
- Excellent bass quality
- Powerful vocal performance
- Outstanding imaging
Product Considerations
- Engaging tuning compromises absolute coherence
- Treble could have a bit more bite
- It only comes with a 4.4mm termination
- Needs a powerful source
- Passive noise isolation is not suited for especially loud environments, such as air travel
Takeaway: The Nautilus is a visually striking and well-built IEM with great looks and technical performance. If someone wants something that sounds great and stands out, it is worth considering.
Video review
Our take on the brand
Jomo Audio is a hifi brand that pioneered several innovative IEM technologies, including 3D-printed medical-grade titanium shells, and early electrostatic hybrid designs with micro-transformers.
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Thieaudio
Monarch MKIII
999
/
Released
2023
At their times, the original Monarch and the Monarch MKII set new standards for best-in-class performance in the global IEM industry. Not only did it redefine the price-to-performance bracket, but it forever changed how IEM manufacturers engineer and tune IEM's. Keeping with the times, the Monarch has undergone another revision to revamp its technical and tonal performance.
Thieaudio is a hifi audio brand best known for headphones with IMPACT2 technology—an in-ear "subwoofer" using two dynamic drivers in an isobaric chamber to boost bass power while keeping frequency constant—and dedicated sound bores to achieve studio-monitor layering and separation. The brand has established a benchmark reputation among reviewers for top-tier tonality at its price tier
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Our Summary
Product Strengths
- Offers excellent midrange resolution, highlighting subtle details in instruments
- Features a safe yet exciting U-shaped tuning suitable for all genres
- Presents a dynamic and exciting sound signature, clear vocal performances, and a resolving staging performance
- The included cable is of high quality and features interchangeable plugs
- Has great audio reproduction accuracy and consistent audio delivery
Product Considerations
- The upper treble may be a little exaggerated for some listeners
- The shell is larger than average for a universal IEM, which may cause fit issues for some
- Stock ear tips are just okay
- Bass resolution could be better
- Does not have an integrated microphone, so a standalone mic is needed to take calls
Comparisons (according to reviewers)
- Vs. Monarch MKII: The MKIII has increased richness in its midrange and an upper treble exaggeration, offering a slightly U-shaped signature compared to the MkII's balanced profile
- Vs. Symphonium Helios: MkIII's midbass body contrasts Helios' dipped lower mids, MkIII has better overall resolution, but a more exaggerated treble
- Vs. 64 Audio U4s: The MkIII is better tuned compared to the U4s, with the U4s having a thicker midrange and weightier timbre
- Vs. MOONDROP x Crinacle DUSK: The THIEAUDIO have a more detailed treble range
- Vs. MOONDROP Blessing 3: The THIEAUDIO have a more elevated bass range
- Vs. TRUTHEAR x Crinacle ZERO: RED: The THIEAUDIO do a better job blocking out external noise and leak less audio
Takeaway: The Monarch MKIII is a well-tuned IEM that is great for all kinds of music and has excellent technical performance. If one is looking for a high-end IEM with a versatile sound, this could be a great choice.
Video review
Our take on the brand
Thieaudio is a hifi audio brand best known for headphones with IMPACT2 technology—an in-ear "subwoofer" using two dynamic drivers in an isobaric chamber to boost bass power while keeping frequency constant—and dedicated sound bores to achieve studio-monitor layering and separation. The brand has established a benchmark reputation among reviewers for top-tier tonality at its price tier
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Sennheiser
IE 600
899
/
Released
2022
Simply beautiful sound, and the lengths Sennheiser will go to achieve it — that is the story of the IE 600. These in-ear devices not only reproduce the detail and emotion of a recording, they transcend it. Because each earphone is a masterpiece. From the hand-finished amorphous metal housing to high-end audio components developed and made by Sennheiser, everything is manufactured to the strictest tolerances.
Sennheiser pioneered the world's first open-back headphones with the HD 414 in 1968, which became the bestselling full-size headphone of all time, and later developed the HD 25, evolving from 1980s broadcast use to become the industry standard in DJ booths worldwide. The brand is known for unique engineering approaches, such as integrating high-voltage amplifiers directly into earcups with Carrara marble chassis in the HE 1, developing proprietary ring-radiator transducers and absorber technology to eliminate resonances, and creating the long-running MD 421 microphone that has remained in production since 1960.
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Our Summary
Product Strengths
- Agreeable, natural sonic signature
- Sounds very good, feels tough, and comes with most of the accessories needed
- Precision-milled housings follow the company’s IE 900, IE 200, and IE 300 models, shape wise, and therefore comfort wise
- A well-engineered product that sounds excellent
- Measured performance closely aligns with a headphone preference curve, so it sounds excellent
Product Considerations
- Basic silicone eartips that don’t fit everyone
- The MMCX connector is an atypical version that will not work with most other cables
- The texture of the AMLOY-ZR01 finish is not everyone's favorite to wear
- Treble is a bit subdued with cymbals resolving reasonably well, but way behind the IE 900
- Stock tips that come with Sennheiser's earphones are poorly designed; the silicone lacks rigidity to the point of which it more often than not collapses against the ear when one inserts the IEMs, thus making a proper seal very difficult to achieve
Comparisons (according to reviewers)
- Vs IE 900: The easier-to-drive IE 900 have a tighter, less thumpy low end and a leaner midrange, which results in better separation between the two, and also in better midrange resolution and clarity
- Vs IE 900: The IE 900 also have a much superior (perceived) treble extension and resolution, and a much wider soundstage
- Vs Final E5000: The final E5000 offer fuller voices, more bass, but less treble than the IE 600, and a narrower stage
- Vs Meze ADVAR: The ADVAR's sound is taller than the IE 600, the latter has more width, and imaging is tight and well-produced in both IEMs, with the IE 600 edging out the ADVAR by the slightest of margins
Takeaway: The IE 600 is a great set of earphones that will appeal to listeners owing to their punchy tonality and is pretty much unparalleled in their class. With the IE 600, listeners get undistorted audio and great isolation, and durable materials that will always sound good.
Video review
Our take on the brand
Sennheiser pioneered the world's first open-back headphones with the HD 414 in 1968, which became the bestselling full-size headphone of all time, and later developed the HD 25, evolving from 1980s broadcast use to become the industry standard in DJ booths worldwide. The brand is known for unique engineering approaches, such as integrating high-voltage amplifiers directly into earcups with Carrara marble chassis in the HE 1, developing proprietary ring-radiator transducers and absorber technology to eliminate resonances, and creating the long-running MD 421 microphone that has remained in production since 1960.
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Westone Audio
MACH 60
846
/
Released
2022
Its six-driver system delivers a balanced, natural soundstage with crisp highs and detailed mids and lows. Whether you're in the studio or on stage, the MACH 60
Westone Audio specializes in in-ear monitors designed by and for musicians, offering universal-fit and custom models engineered for accuracy, comfort, and stage-ready reliability. The MACH series delivers their popular custom-quality sound in a universal fit, the AM Pro X line preserves on-stage ambience for performers, and the Pro X series uses efficient sound channels for cleaner, more balanced frequency response. Praised by musical icons for decades, Westone emphasizes uncompromising performance for both professionals and discerning listeners.
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Our Summary
Product Strengths
- Very comfortable, suitable for long listening sessions and wearing in bed, due to its small size, lightweight design, and ergonomic shape
- Delivers a neutral and natural sound presentation, making it appropriate for stage and studio monitoring
- Excellent sound isolation, effectively blocking out external noise
- Good detail retrieval and resolution, presenting information accurately
Product Considerations
- May sound a bit boring or dull if one is looking for a more dynamic and engaging sound with more bass and treble emphasis
- The plastic build quality may not feel as premium as some other IEMs
- Requires a bit more power to drive it to sound best
Comparisons (according to reviewers)
- Mach 60 has a more neutral presentation, while ADV M512D is more elevated in the mids and treble and has more bass impact
- Mach 60 is more neutral and natural, while Unique Melody MEST delivers excellent detail and resolution
Takeaway: The Westone Mach 60 is a comfortable and well-built in-ear monitor that delivers a neutral and natural sound, great for musicians and audiophiles looking for an accurate representation of their music. It is a great tool as a stage monitor and comfortable for long listening sessions.
Video review
Our take on the brand
Westone Audio specializes in in-ear monitors designed by and for musicians, offering universal-fit and custom models engineered for accuracy, comfort, and stage-ready reliability. The MACH series delivers their popular custom-quality sound in a universal fit, the AM Pro X line preserves on-stage ambience for performers, and the Pro X series uses efficient sound channels for cleaner, more balanced frequency response. Praised by musical icons for decades, Westone emphasizes uncompromising performance for both professionals and discerning listeners.
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FIIO
FH9
558
/
Released
2021
FiiO's new flagship hybrid IEMs, the FH9, is the result of two years' worth of intense research on how to fully take advantage of the strengths of hybrid IEMs and push the boundaries of what they can sound like. This 1 dynamic 6 BA driver design (7 in total) features a 2nd generation 13.6mm DLC diaphragm dynamic bass driver fully capable of extending to the lowest frequencies with ample punch. Mid and high frequencies are handled by a custom 6 Knowles BA setup that accurately reproduces every last musical detail.
FiiO stands out for integrating unique features into portable audio devices, such as their BTR7 DAC/amplifier with its screen and wireless charging, and their KB3 mechanical keyboard with a built-in DAC/amp. The brand caters to audiophiles seeking personalization through products like their pioneering X7 music player with interchangeable amp modules and their compact R7 desktop system that combines streaming, DAC, and headphone amplification capabilities.
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Our Summary
Product Strengths
- Convincingly balanced sound performance with a slight bass emphasis
- A wide and deep soundstage
- High-quality build, using a titanium housing, making it feel robust
- Good clarity and sparkle in the highs, with a natural and airy treble that feels relaxed
- Comes with a decorative, braided balanced cable made of silver wire, with interchangeable ends
Product Considerations
- A larger earbud which may affect the fit for some users
- A slight emphasis in the bass area and a sober sound, which may be a matter of taste
- Semi-open design is less isolating
- High frequencies might be too elevated for some
Comparisons (according to reviewers)
- Vs FiiO FH5s: Better bass texture, transparency, resolution, and treble definition, and sounds more cohesive and balanced
- Vs FiiO FH7: Better design, a better carrying case, more accessories, better build quality, better refinement, more resolution, transparency, treble definition, dynamism, and a wider and deeper soundstage
- Vs Kinera Norn: Better mid-range definition, tonality, and transparency, the Norn has a more V-shaped sound signature with splashy and aggressive treble
Takeaway: The FiiO FH9 is a well-crafted IEM with a balanced sound signature and customizable options, making it enjoyable for a wide range of listeners. It has excellent detail retrieval and a wide soundstage that immerses the listener in the music.
Video review
Our take on the brand
FiiO stands out for integrating unique features into portable audio devices, such as their BTR7 DAC/amplifier with its screen and wireless charging, and their KB3 mechanical keyboard with a built-in DAC/amp. The brand caters to audiophiles seeking personalization through products like their pioneering X7 music player with interchangeable amp modules and their compact R7 desktop system that combines streaming, DAC, and headphone amplification capabilities.
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