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.
All
A3t
reviews
[{"title":"64 Audio A3t - An Extensive Breakdown","link":"https://headphones.com/blogs/reviews/64-audio-a3t-review?srsltid=AfmBOoqfoZRK6gy71KSuxPJ_SGqtdMv29bchkhACT7f6XirCRXvjnGwB","source":"headphones.com","datePublished":""}]
An excellent review of a great product
/
Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022
Video Review
Manufacturer details
Features
Specifications
- Transducer Type: Balanced Armature
- Transducer Configuration: 1 BA low, 1 BA mid, 1 tia high
- Bore Configuration: Single
- Frequency Response: 20Hz – 20kHz
- Sensitivity: 109dB/mW (105mV) @ 1kHz
- Impedance: 11Ω @ 1kHz
- Crossover: Integrated 3-way passive crossover
- Isolation: 20dB w/ m20 module, -15dB w/ m15 module
Description
With A3t our Tia technology is available at a new lower price point, along with LID and our patented Apex and 3Dfit tech. The goal with A3t was simple: make a reference monitor that rivals products more than 5x its price, this simple yet powerful arrangement of balanced armature drivers and crossover components achieves that perfectly.
Release Timeline
Manufacturer Site
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
Select product comparisons
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.
See All Products
Avg. Product Price
$501-$1,000
Used For Sale
0
Available (Scroll Down)
Brand Popularity
776
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
20
Founding Year
1964
Our take on the brand
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Look inside the brand
Brand Page
Our interview with the brand
What are two key technological innovations or strong opinions that differ you from other brands?
What's your approach to customer support?
What are your favorite tracks for showcasing the strength of your products?
What other products pair best with yours?
From our interview with
.
Brand Page
Used
64 Audio
All of the Brand's Used Products
What if you spend more?
.png){kind=small}
64 Audio
U4s
1099
1099
/
11
Reviews
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Expand Details
.svg)
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
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Product Page
Product Page
64 Audio
Volür
2499
2499
/
11
Reviews
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Expand Details
Our summary
Product Strengths
- Delivers a bass-intense sound with strong rumble and thunder, while remaining fast, impactful, and dynamic
- Offers a wide and airy soundstage with a holographic sense of separation, and precise imaging
- Provides a smooth and open midrange with a natural character, and excellent resolution and layering of instruments and vocals
- Includes Apex modules for altering the tonality of the sound
- Features a durable and attractive design with aluminum shells, and a unique abalone faceplate
Product Considerations
- May have a large upper treble peak that can cause a shimmery sibilant sheen to vocals, or make some instruments sound clicky or tizzy
- The bass response could be too impactful for analytical listeners
- The quality of the stock cable might not be worthy of the IEM's higher-end status
Comparisons (according to reviewers)
- Vs 64 Audio U12t: Volür offers something very similar, but with notable upgrades, especially in bass texture and tactile presentation
- Vs 64 Audio U4s/Nio: While Volür improves upon the U4s and Nio's bass, the difference isn't dramatic, and the U4s/Nio are arguably better tuned due to the absence of a big upper treble peak
- Vs FiR Audio Neon 4: The Ne4 has a stronger bass emphasis and warm color, while Volür has more natural timbre, and stronger vocal performance
- Vs Sennheiser IE900: Volür has a better-tuned upper midrange and more comfortable ergonomics, but the IE900 has more textured bass, and a controlled mid-treble energy
Takeaway: The Volür is a well-built IEM that delivers a bass-forward sound with a wide soundstage and excellent imaging, making music sound exciting and immersive. With the ability to change the sound with different modules, it is a flexible option for listeners who want to tailor their listening experience.
Video review
Our take on the brand
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Product Page
Product Page
64 Audio
Nio
1699
1699
/
8
Reviews
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Expand Details
Our summary
Product Considerations
- Stock cable is functional, but may be considered flimsy or of lower quality, and tangles easily.
- Treble response is more laid-back and subdued.
- Bass can be overbearing with the M15 and M20 modules, potentially muddying the signature and overshadowing image clarity.
- Most intimate stage of the 64 Audio IMs.
Video review
Our take on the brand
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Product Page
Product Page
64 Audio
Solo
1399
1399
/
7
Reviews
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Expand Details
Product Strengths
- Beautiful aesthetic design, featuring a copper faceplate with the 64 Audio logo and a metal shell
- Comfortable and secure fit, similar to other 64 Audio universal IEMs, suitable for extended listening
- Bass is fast, clean, textured, and well-separated, without bleeding into the midrange
- Midrange is a highlight, with natural, textured, and realistic vocals for both male and female
- Treble is detailed, transparent, and sparkly without being overly aggressive, maintaining a crisp and rounded sound
Product Considerations
- The Solo sounds like many other existing 14.2 mm planar IEMs
- Soundstage width is average
- Eartip rolling may be required to find the best fit
- Slight metallic timbre to the sound
- The nozzle length and angle, as well as the connector housing on the shells, may cause the cable to hit the ear on the top
Comparisons (according to reviewers)
- The Solo has better resolution and accuracy, especially with complex tracks, while the 64 Audio U4s is more customizable and isolating with a more dynamic bass
- The Solo has a more tamed treble response than the 7Hz Timeless
Takeaway: The 64 Audio Solo is a finely tuned planar magnetic IEM that is both beautiful and comfortable. It offers a rich, detailed sound, especially in the midrange, making it a great choice for those who enjoy immersive and high-quality audio.
Video review
Our take on the brand
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Product Page
Product Page
What competes at this price?
64 Audio
A3e
749
/
Released
Our versatile, three-driver custom in-ear monitor provides impressive clarity and warmth for any instrument or genre. The A3e is ideal for vocalists, drummers, or any single-instrumentalists looking for a professional IEM to use onstage. This is a great option for artists seeking a detailed soundstage, neutral tuning, and a transparent and musical sound.
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Expand Details
Our Summary
Video review
Our take on the brand
64 Audio is a brand best known for IEMs with highly novel technologies like LID (Linear Impedance Design) circuits that maintain consistent frequency response across different sources, and unique driver configurations, including the industry-first 18 balanced-armature driver U18t and the Solo's single 14.2mm planar magnetic driver with dual Helmholtz resonator chambers.
Product Page
Product Page
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
Expand Details
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
Product Page
Product Page
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.
Expand Details
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.
Product Page
Product Page
.png){kind=small}
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.
Expand Details
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.
Product Page
Product Page
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.
Expand Details
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.
Product Page
Product Page
How to buy
Headphones
Search all hifi products
Explore our database of 10,000+ new and 25,000+ used hifi products.
