RANKING

Rank 21 out of 52 Summarized in this category Rankings based on: • Pros-to-cons ratio • Number of reviews • Category average

64 Audio

U4s

Name: U4s
Brand: 64 Audio

around $1100

All prices are estimates and may vary from actual prices.

191 Pros

71%
16 reviews (3h 5m)

77 Cons

Discover the 64 Audio U4s, where professional-grade engineering meets unparalleled listener control. Built on a foundation of patented audio technologies, the U4s delivers an energetic and deeply engaging sound experience. Its hybrid driver system provides a spectacular bass performance—punchy, textured, and rich with detail—making it phenomenal fo...

Summary of pros and cons from human reviewers, put together by AI

72%

126 vs 49

Sound Quality

75%

18 vs 6

Comfort

75%

6 vs 2

Build Quality

67%

28 vs 14

Value for Money

82%

9 vs 2

Design

Reviewer verdict

Across 16 YouTube reviews, the 64 Audio U4s earns a Summa score of 3.9/5, ranking #21 among Wired Earbuds. Reviewers most often praise its sound quality, value for money, comfort, while the most common criticisms concern sound quality, value for money.

The 64 Audio U4s is widely praised for its detailed, engaging sound signature, with 126 mentions highlighting strong bass performance, clear treble, and natural midrange timbre. Reviewers repeatedly note the effective modular Apex system and multiple-driver hybrid design that let users tailor bass, isolation, and overall voicing, and many find imaging, staging, and technical resolution excellent for its class. Comfort, build quality, and a generous accessory package (including premium cable options and a sturdy case) are commonly mentioned as positives across reviews. Overall sentiment is that the U4s delivers refined, versatile sound and a premium, well-supported package for listeners seeking a lively, bass-forward IEM experience.

Criticisms—appearing across reviews—focus mainly on tuning choices and soundstage/imagery limitations, with 49 cons noting a recessed or weak midrange and some unevenness in upper mids/treble that can make vocals less forward or occasionally harsh. Several reviewers also report that module choices can produce extremes (M20 muddy, M10 too lean, MX low on isolation), tip selection strongly affects bass, and the imaging or soundstage can feel two-dimensional at times. Value and price come up as concerns in 14 mentions, with multiple comments that the product sits at a premium price point that some feel is hard to justify. A smaller number of reviewers flag comfort fit issues with stock cable and tips, and maintenance concerns around grills and interchangeable modules.

Analysis based on 16 YouTube reviews (3h 5m of video) with 191 pros and 77 cons extracted.

Pros (191)

Sound Quality (126)

Right tip selection greatly improves bass rumble and overall sound quality ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 4:48
Bass quality prioritized over quantity, with quick, punchy, and well-matched bass response ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 5:05
Relatively realistic and natural bass sound signature, not overly exaggerated ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 6:00
Good performance with hard rock and acoustic/electronic music genres ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 7:38
Natural and less bright treble response, reducing fatigue and providing room to breathe ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 8:53
Upper treble with TIA balanced armature driver provides high fidelity and resolving top end ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 10:13
Good imaging and decent soundstage, though not very wide ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 9:53
Smooth and laidback tuning preferred by some listeners ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 12:04
Pleasant and unoffensive tuning suitable for specific genres and listeners ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 13:32
Includes different modules that change frequency response, allowing customization of bass and sound signature. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 1:28
Outstanding bass performance due to dynamic driver and three balanced armatures, with phenomenal separation and resolution of bass. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 5:12
Bass has great dynamics with thump and oomph, especially good for electronic music. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 5:58
Ability to control bass via modules is very effective and not a gimmick. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 6:20
Timbre is very accurate, making guitars and vocals sound real and natural. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 6:51
Excellent imaging, providing good 3D spatial sound which benefits gamers and music producers. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 7:46
Sound is colored but enjoyable, avoiding boredom from neutral sounds. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 8:00
High frequencies are not fatiguing or sibilant, allowing long listening sessions. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 8:19
Filtros intercambiables que permiten cambiar la firma de sonido para ajustar graves, agudos o medios. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 2:20
Bajos con velocidad impresionante, limpieza y detalle sin fatigar, con presencia de sub-bajo. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 4:17
Medios delicados, cristalinos y suaves pero con fuerza para distinguir voces e instrumentos. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 4:56
Agudos prácticamente perfectos, sin sibilancias, con detalles y sin lastimar el oído. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 5:36
Escena sonora suficientemente amplia y con excelente posición de instrumentos. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 6:17
Separación instrumental excepcional, ideal para quienes quieren seguir instrumentos específicos sin confusión. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 6:46
Muy buena amplificación con DAPs y amplificadores dedicados, especialmente amplificador clase A. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 9:43
64 Audio has expertise in tuning IEMs and uses passive analog filter networks for tuning. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 2:04
They claim linear impedance design which requires expertise. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 2:16
The driver is low in distortion, linear, and durable, suitable for tuning. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 5:28
Sound is very even with a silky top end without harshness and a spot-on mid-range. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 3:34
Sound is very smooth and flat with a lot of detail and clarity. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 5:30
Soundstage is wide but not too wide. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 5:37
Balanced bass. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 5:42
Mid and upper mid-range is super well defined and not harsh. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 5:48
Great for live playing due to flat balanced tone. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 3:45
Quad drivers provide a nice flat balance tone. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 3:33
Spectacular bass performance, dynamic, punchy with great decay ▶ VOLUR!!! this is... @ 0:44
Bass has every good quality you want in a bassy IEM ▶ VOLUR!!! this is... @ 0:55
Bass gives male vocals a richer kind of voice ▶ VOLUR!!! this is... @ 1:19
Works phenomenally well for jazz, rock and roll, heavy metal genres ▶ VOLUR!!! this is... @ 1:52
Bass is satisfying to listen to despite its amount ▶ VOLUR!!! this is... @ 2:00
Does not sacrifice any level of details despite the bass ▶ VOLUR!!! this is... @ 2:04
Treble area is surprisingly smooth yet nuanced with a lot of micro details ▶ VOLUR!!! this is... @ 2:10
Percussion hits come across very clean and clear ▶ VOLUR!!! this is... @ 2:16
Technical performance is end game level of details ▶ VOLUR!!! this is... @ 3:20
Bass and details balance is rare to find ▶ VOLUR!!! this is... @ 3:36
Apex modules offer tuning options to adjust bass and liveliness ▶ VOLUR!!! this is... @ 3:52
M15 module offers most balanced signature with enough bass fun ▶ VOLUR!!! this is... @ 4:07
M12 module offers less bass and more lively vocals ▶ VOLUR!!! this is... @ 4:16
Velor has more character compared to u12t ▶ VOLUR!!! this is... @ 5:14
Velor beats u12t and u4s in bass quality ▶ VOLUR!!! this is... @ 6:08
Features a 14.2 mm planar magnetic driver common in planar magnetic IEMs. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 2:03
Incorporates dual Helmholtz resonators to reduce high frequency amplitude and attenuate narrow frequency bands, making treble more digestible. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 3:08
Bass response is well extended and deep, with quality over quantity, providing a thick and weighty bass presence. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 7:11
Upper mids and vocals have nice timbre, cohesive and relatively natural portrayal. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 8:28
Treble is very digestible and softly presented with excellent tonality and brilliance, without sibilance or dullness. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 10:09
Soundstage is decently wide with good instrument separation due to slightly open-back design. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 10:54
Helmholtz resonator technology may influence future planar magnetic IEM designs. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 12:29
Incorporates patented Tia technology with TR driver for top end and PR single board design to reduce resonances and distortion, enhancing clarity and resolution. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 3:59
Lid (linear impedance design) ensures consistent sound signature and frequency response across different source devices. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 7:06
Electrical crossover used instead of dampeners for better sound quality. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 7:50
Tuning is tasteful, presenting low, mid, and treble regions very well. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 8:23
Bass is high quality with good texture, slam, punch, and rumble, especially with electronic and rock music. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 9:29
Mid-range is very natural and detailed, with excellent presentation of vocals, string instruments, and orchestral music. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 11:39
Treble is accurate with good airiness, resolution, clarity, and a nice edge to notes, despite dips in frequency response graph. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 13:00
Compared to Andromeda Emerald C, u4s has more natural mid-range and better overall balance. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 14:05
Compared to Moondrop Monach Mark II, u4s has more natural mid-range and a more controlled treble. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 16:09
The 64 Audio U4s is a hybrid with a dynamic driver and four balanced armatures per side, incorporating innovative patented technologies. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 2:01
Sound is impressive, energetic, and full-bodied with a tonal balance that is more lively than neutral. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 5:29
The bass is strong, well-defined, with excellent dynamics, extension, and texture, especially with the M15 module. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 6:43
The bass has a spacious, ambient quality that adds a sense of air and depth. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 7:58
The midrange is clear and natural in timbre, though slightly recessed compared to bass and treble. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 9:28
Treble has a tactile, physical presence with a pleasing brightness that enhances detail without being overly harsh, especially with the M15 module. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 11:16
Excellent technical performance with very good resolution, detail, and imaging. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 12:42
The soundstage is large and immersive with precise instrument positioning. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 12:53
Overall, the U4s is a sophisticated, energetic, and engaging IEM that is highly recommended for those seeking a lively sound signature. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 13:28
The earphone has a hybrid driver setup with dynamic and balanced armature drivers plus a tia driver for highs, orchestrated by a four-way passive crossover with advanced technology for consistent sound. ▶ 64 AUDIO U4S, excelso @ 2:38
M20 module provides excellent isolation and strong sub-bass and bass, ideal for rap, hip hop, and electronic music. ▶ 64 AUDIO U4S, excelso @ 4:06
M15 module offers a balanced sound with still strong bass, likely to please most listeners. ▶ 64 AUDIO U4S, excelso @ 4:36
M12 module reduces bass but maintains texture and resolution, with a wider soundstage and more detail. ▶ 64 AUDIO U4S, excelso @ 5:08
MX module has the least isolation and bass, great for those who prefer more mids and highs. ▶ 64 AUDIO U4S, excelso @ 5:45
The earphone performs well with various sources, maintaining volume and scaling with source quality. ▶ 64 AUDIO U4S, excelso @ 6:21
Has a U-shaped sound signature with emphasized bass and treble and recessed mids, suitable for many genres. ▶ 64 AUDIO U4S, excelso @ 6:47
Bass is strong, extended, and textured, delivering impactful low frequencies. ▶ 64 AUDIO U4S, excelso @ 6:59
Vocals are natural and pleasant despite recessed mids, with good timbre and presence. ▶ 64 AUDIO U4S, excelso @ 7:26
Highs are very detailed, bright, and airy, providing excellent extension and smoothness. ▶ 64 AUDIO U4S, excelso @ 8:14
Soundstage is wide and holographic with excellent imaging and detail retrieval. ▶ 64 AUDIO U4S, excelso @ 8:49
Performs excellently in gaming for positional audio and immersion, especially with M12 and MX modules. ▶ 64 AUDIO U4S, excelso @ 9:29
Good for simulation games with realistic and immersive sound. ▶ 64 AUDIO U4S, excelso @ 10:19
Enjoyable for movies with the right module choice, providing fun and engaging experience. ▶ 64 AUDIO U4S, excelso @ 10:39
The sound quality is incredible with tight and defined bass, smooth mids, and well-balanced highs and trebles. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 3:30
The sound stage created by multiple drivers per ear is wider and more comfortable compared to traditional headphones. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 2:12
Six driver model is sufficient for most users and continues to improve over time. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 8:58
More detail-oriented sound with solidity and weight in notes compared to duo 2 ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 1:18
Better sound quality than duo 2 with more substance, detail, resolution, and definition ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 3:42
Good bass presentation: punchy, voluminous, with deep sub-bass and no issues with mid-bass or upper bass ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 4:08
Slightly slower bass speed adds weight and layering to notes ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 4:37
Midrange has good texture, tonality, and timbre with no major issues, slightly recessed but well defined ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 4:56
Treble is well defined, detailed, with good layering and separation, instruments energized ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 5:39
More musical and forgiving sound signature compared to more analytical competitors ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 7:09
Good transparency and clarity without harshness, comfortable for most listeners ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 8:20
Tall soundstage with slightly rounded x-axis, good staging and detail ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 8:38
More forgiving with harsh tracks and less aggressive than some competitors ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 9:33
Technical design includes four drivers: one dynamic for lows, two balanced armatures for low and high mids, and a TIA driver for highs, providing detailed sound. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 2:39
TIA driver design eliminates acoustic tubes, reducing obstruction and resonance for clearer sound. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 3:01
Linear Impedance Design (LID) ensures consistent frequency response regardless of audio source. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 3:41
Electrical low pass filter crossover circuit eliminates unwanted frequencies before reaching drivers. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 3:59
Apex modules regulate canal air pressure to reduce listening fatigue and improve soundstage realism. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 4:10
Soundstage is considerable in size, especially in height and depth, creating a spacious and immersive listening experience. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 5:29
Hard pans are perceived behind the head rather than to the sides, offering a unique spatial sensation. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 6:28
Bass is firm, fast, and detailed with a tasteful amount of sub-bass rumble, especially with the M12 Apex module. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 7:23
High bass is reserved, providing clarity and separation without muddiness or excessive warmth. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 8:03
Mids are natural with a slight semi-boosted high midrange, making vocals realistic and clear without being overly emphasized. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 9:22
High treble is detailed and forward, adding texture and brightness without harshness or unpleasant peaks. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 10:15
The boosted high treble adds a unique textural quality to instruments, enhancing transient detail and providing a relaxing clicky sensation. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 11:04
Overall sound signature is balanced, bright without being painful, pleasant, detailed, natural, and versatile across genres. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 13:05
The 64 Audio U4S has fantastic tuning with a balanced yet energetic and fun sound. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 5:46
The mid-range is fantastic, with smooth, clear, and forward vocals that are warm and detailed. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 5:49
The bass is solid and decent quality, comparable or slightly better than the Supernova. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 4:28
The soundstage is solid and very wide, allowing sounds to come from far left and right. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 11:16
The overall detail is solid for the price, more detailed than some competitors like the Mystic 8. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 7:14
The treble is detailed and extends without being harsh, though with some minor issues. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 7:40
The U4S sounds the closest to the Neo out of all the other IM. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 8:34
It has a bass boost that's almost just as big as the Neo, but is elevated in the upper mids and treble in key areas to give it a more balanced overall sound profile. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 8:38
The extra treble helps bring notes closer to the foreground than the Neo does and gives extra clarity up top. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 8:43
The perceived technical ability of the U4S is just as good as the Neo with great bass dynamics and impact and arguably better resolution. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 9:05
10 driver design with multiple balanced armature and dynamic drivers for a full range experience ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 0:51
Clever Apex tuning filters that can be replaced to subtly affect sound signature ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 2:05

Value for Money (28)

64 Audio u4s is one of the best IEMs in the market. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 0:03
Overall package and versatility is unbeatable in its price range (~$1500 AUD). ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 9:11
Reviewer personally bought the headphones due to their quality and sound. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 10:18
Calidad de audio bestial, con una construcción y materiales infinitamente mejores comparado con otros audífonos de gama alta como el High Five Man Sanner. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 0:58
The brand offers comfort, experience, and extensive R&D. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 2:33
64 Audio invests time in tuning, building expertise, and multiple design iterations. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 3:10
They do a lot of measurements and collaborate with creators and stores. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 2:58
The product benefits from in-house or controlled design processes. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 3:58
64 Audio is a reputable company with good products. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 6:15
They are a worthy universal fit option for touring musicians, offering great sound quality at a much lower price than custom molded in-ears. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 5:39
High quality custom in-ear monitors from 64 Audio, a brand the reviewer has wanted for over 10 years. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 1:30
Fast shipping and professional packaging. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 1:54
Includes an 8-wire cable and 3.5 and 4.4 balanced cables, a welcomed change for 64 Audio. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 1:09
Comes with standard 64 Audio accessories like leather carrying case, cleaning tool, cloth, sticker, and shirt clip. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 1:52
The unboxing experience is very premium and well curated with a large package, neatly arranged IMs, cable, leather carry case, cleaning tool, and a fine assortment of ear tips. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 1:13
Overall, u4s is a compelling proposition in 64 Audio lineup with tuning similar to the premium u12t and a complete package at its price point. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 18:17
64 Audio is a renowned American manufacturer focused on professional stage monitoring with a strong reputation. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 0:29
Good unboxing experience with a nice presentation and a solid selection of accessories including a rigid case, multiple tips, interchangeable modules, cleaning tool, and clip. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 2:46
64 Audio u4s brings the complete experience of the brand even as the entry-level model. ▶ 64 AUDIO U4S, excelso @ 0:40
The unboxing is simple yet functional and elegant for its price range. ▶ 64 AUDIO U4S, excelso @ 1:07
The carrying case is well-made with leather and suede, including a mold for all ear tips. ▶ 64 AUDIO U4S, excelso @ 1:28
Cheapest hybrid IEM from 64 Audio with three BA drivers and one DD driver, including TR driver and Apex modules adding value ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 0:09
Excellent IEM in the $1100 price range, a good upgrade over the duo 2 ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 0:54
64 Audio u4s is 64 Audio's most affordable Universal IEM offering at $1099, still featuring the best of 64 Audio's design principles. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 0:34
Includes a hard leather case, multiple ear tips (foam and silicone), premium cable, Apex modules, cleaning tool, and sticker in the box. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 0:56
Offers excellent value as a reasonable endgame IEM at just over a thousand dollars. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 13:58
The U4S takes a lot of what I enjoyed about my favorite 64 Audio IM and brings it down into its most accessible one yet at $1,100. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 8:21
The U4S is top of mind as the very first 64 Audio IM I'd recommend at that price. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 9:20

Comfort (18)

Comes with a variety of tips including Spin Fits foam tips and silicon buds, with Dcone tips being the best fit. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 1:45
Comfortable fit with many options to make it work well in ears. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 4:35
Replacing the stock cable with a better one improves comfort and reduces microphonics. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 9:37
Variedad de ear tips de silicona y memory foam que permiten ajustar el sonido a preferencias personales. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 3:16
Comodidad aceptable para uso prolongado, aunque sobresale un poco sobre el pabellón auditivo. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 10:21
64 Audio u4s feature Apex core technology which acts as a pressure relief valve, reducing ear fatigue during long use. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 1:56
The package includes a variety of ear molds (rubber and foam) in multiple sizes, ensuring a good fit for everyone. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 3:06
The fit is much better with a tight seal around the ear, completely closed off. ▶ New Custom IEM's 64 Audio A4s Unboxing and First Impressions @ 5:09
Fairly long spout and ear tips allow for comfortable long hours of wear without strain or hotspots. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 3:36
Comfortable and secure fit, allowing long usage without discomfort. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 4:39
Comfortable and ergonomic design with no sharp edges, suitable for long use. ▶ 64 AUDIO U4S, excelso @ 3:09
64 Audio u4s provide superior comfort and noise isolation due to custom molding, allowing for immersive music experience and reduced ear fatigue. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 3:15
Custom fit keeps the sound nice and tight, allowing lower volume usage and better blocking of external noise. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 4:10
Comfortable for long periods of use, ideal for worship leading and content creation. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 9:29
Smaller, comfortable fit with good seal and isolation, stable inside the ear with no discomfort ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 1:49
The fit is comfortable with smooth rounded edges that don't poke or strain the outer ear; lightweight and easy to wear for long periods, rated above average in comfort. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 1:21
The L-shaped two-pin cable design allows comfortable wire wrap around the ear. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 1:43
Comfortable fit with slim and long nozzle, more comfortable than Sony Z1R ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 3:40

Design (9)

The shade of blue and marble glass design with 64 Audio logo looks pretty. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 1:15
Modules are easy to replace, enabling quick changes to sound signature. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 3:18
Comes with a solid, nice case for storage. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 4:44
Gorgeous looking, one of the most favorite IEMs in terms of looks ▶ VOLUR!!! this is... @ 0:04
Solo has a gorgeous copper mesh faceplate with a captivating look. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 0:51
New royal blue color with perloid faceplate looks very good. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 2:52
Offers interchangeable modules (M20, M15, M12, MX) that allow customization of isolation and sound signature. ▶ 64 AUDIO U4S, excelso @ 3:37
Modular system allows tailoring sound and isolation to personal preference, enhancing versatility. ▶ 64 AUDIO U4S, excelso @ 12:27
Four Apex modules available, with M12 12dB damp module specially made for this IEM, good stock setup ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 2:57

Build Quality (6)

Cable de calidad rígido con conector de dos pines, mejor que el del High Man Sanner. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 3:43
Build quality is classic 64 Audio with anodized aluminum shells that feel sturdy and durable. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 2:32
Excellent build quality with mostly metal construction and a compact form factor. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 3:38
Comes with a robust Black Premium cable with quality connectors. ▶ 64 AUDIO U4S, excelso @ 1:54
Despite being 10 years old, the build quality and sound performance remain exceptional. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 8:04
Ergonomic anodized aluminum shell provides great durability and keeps the IEM lightweight. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 0:44

Noise Isolation (3)

They provide 20 dB of isolation, effectively blocking unwanted noise. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 2:53
Apex technology with interchangeable MX modules allows user to choose level of isolation and low-end response. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 4:56
Good noise isolation that varies with the interchangeable modules, though not fully sealed. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 4:53

Connectivity (1)

The cable uses IPX connectors that pivot, making the earbuds more compact and easy to connect/disconnect. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 4:56

Cons (77)

Sound Quality (49)

Initial bass response underwhelming without correct tip selection ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 3:03
Mid-range is the weakest component, lacking forwardness and vocal presence ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 6:25
Does not grip or command attention in mid-range vocals ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 6:46
Not ideal for vocal-centric music due to lack of mid-range push ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 8:35
Treble is slightly dark leading up to upper treble, causing some latency in detail ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 11:02
Soundstage is not very wide, could be improved ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 10:05
Less detailed and resolving treble compared to competitors like FiiO M5 ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 9:40
Bluetooth is compressed and inferior to wired IEMs like the u4s. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 0:33
High frequencies are slightly less detailed compared to higher-end models like the u12t. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 8:55
La firma de sonido cambia con los filtros, pero no es un cambio radical, lo que puede limitar ajustes más profundos. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 2:56
Los medios no llegan al nivel de detalle del High Man Sanner, que puede sofocar un poco. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 5:15
La escena sonora no es gigantesca, aunque es suficientemente grande para disfrutar. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 6:17
The low end is not as robust as desired; reviewer would prefer a bit more bass. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 3:41
Sacrifices overall cleanliness of lower mid-range, female vocals have extra heftiness and are subdued ▶ VOLUR!!! this is... @ 1:04
Female vocals are not as lively and are recessed in upper mid range ▶ VOLUR!!! this is... @ 1:28
Not recommended for genres with heavy female vocals like K-pop, J-pop, Anime ▶ VOLUR!!! this is... @ 1:38
Treble can get a little hot from time to time, especially in the air region ▶ VOLUR!!! this is... @ 2:27
Tuning is not very versatile, geared towards specific genres ▶ VOLUR!!! this is... @ 2:57
M20 module has too much bass and feels muddy ▶ VOLUR!!! this is... @ 4:27
M10 module is too lean and not liked ▶ VOLUR!!! this is... @ 4:35
Not recommended to use without modules as it sounds very bad ▶ VOLUR!!! this is... @ 4:38
Planar magnetic IEMs including Solo may have upper mid-range energy that can be fatiguing or have a small amount of bite, which may not suit all listeners. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 5:24
Solo's upper mid-range vocals can sometimes be nasally and unnatural, which can be offputting over time. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 9:03
Soundstage can narrow on some sources and tracks, so it may not always be as open as expected. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 11:43
Reviewer does not see Solo as a daily driver or a planar magnetic IEM that changed their opinion on the technology. ▶ A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review @ 12:14
Bass quantity may not be the highest, and bass is not the fastest or most resolving compared to some other IMs. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 11:17
Mid-range frequency response shows a dip/scoop which might alarm some, but actual presentation is natural. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 11:39
Treble frequency response graph shows dips, but actual sound is surprisingly good. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 13:00
Compared to Andromeda, u4s has a narrower soundstage with less sub-bass focus. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 14:39
Compared to Moondrop Monach Mark II, u4s bass is less fast and agile. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 16:31
Compared to Moondrop Monach Mark II, u4s treble is less sparkly and less bright. ▶ 64 Audio U4s Review - The Most Affordable 64 Audio IEM @ 17:10
The sound signature is not neutral or balanced; it is more colored and energetic, which may not suit those seeking neutrality. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 13:50
The midrange is somewhat recessed and can lack body, making vocals and mids less forward. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 9:31
With modules that reduce bass, the treble can sound metallic or overly bright, which some listeners may find fatiguing. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 11:00
The brightness in the treble can make some recordings with thin cymbals sound unnatural or harsh. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 12:04
The M20 module's bass can overpower mids and reduce soundstage width, making it less suitable for some listeners. ▶ 64 AUDIO U4S, excelso @ 4:20
The bass speed is somewhat slow, which can affect the listening experience. ▶ 64 AUDIO U4S, excelso @ 7:18
Mids are recessed, causing some instruments to lack presence compared to competitors. ▶ 64 AUDIO U4S, excelso @ 7:50
Separation of instruments could be better in bass-heavy tracks. ▶ 64 AUDIO U4S, excelso @ 9:20
Not the best treble range in this price range, some IEMs can do better in treble detail ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 5:50
Slightly recessed midrange vocals, which might not suit all preferences ▶ @64Audio 64audio U4s Review ft. Fibae 5 @ 5:15
Some listeners sensitive to treble might find the mid treble a little too prominent. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 10:46
The boosted high treble is not entirely realistic and might be a drawback for some listeners. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 11:38
Occasionally, very specific acoustic snare drums can sound a bit too scratchy or harsh, which is a minor nitpick. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 12:43
The bass quality is lacking tactile impact and has a softness that makes it less impressive than expected. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 4:37
The electric driver (likely a Piso driver) has a slight metallic shimmer in the upper treble, causing a tambour issue. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 7:40
The soundstage lacks height and depth, making it more two-dimensional than expected. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 11:22
The imaging is only passable and not very impressive for the price range. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 12:05
The only tuning nitpick is that I wished its upper mids peaked closer at 3 kHz like the U6T does rather than at 2 kHz, which would help clean up its sound a little bit more. ▶ Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 @ 8:54

Value for Money (14)

High-end tax: expensive for what it offers, not great enough to be sole IEM ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 12:54
The planar drivers used in the 64 Audio Solo are found to be low cost ($55 each) compared to the high price of the IEM ($1400). ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 0:16
People are displeased that expensive IEMs use relatively cheap drivers. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 0:26
Drivers for IEMs are usually very cheap, often pennies to a few dollars. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 0:59
The high price of the product is not justified by the cost of the drivers alone. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 1:53
The price includes brand, tuning, comfort, and experience rather than just materials. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 2:33
The bidding and matching process of drivers can increase cost significantly. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 4:20
Most companies use off-the-shelf drivers, which are cheap, so the price is not driver cost. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 4:42
The driver is not the main determinant of sound quality; design and engineering are more important. ▶ $55 drivers in a $1400 IEM... Is this okay?? @ 5:44
The price of $899 is still quite high for weekend warriors or casual users. ▶ Checking Out The 64 Audio Aspire 4 IEMs @ 5:29
The price is high at around $1000, making it a premium product not affordable for everyone. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 1:34
64 Audio u4s is not cheap, priced at $1099, even as an entry-level model. ▶ 64 AUDIO U4S, excelso @ 0:40
In-ear monitors require an in-ear monitor system which can be expensive and daunting to set up for a whole band. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 4:47
Adding monitors to the stage can add noise and other potential problems compared to wedge monitors. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 5:57

Comfort (6)

Tips provided are not particularly unique or high quality; tip swapping necessary ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 3:24
Stock cable is quite rigid, annoying, and does not fit well on ears. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 3:43
Stock cable has microphonics and is stiff, which can be annoying and cause coiling issues. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 9:51
El audífono sobresale un poco sobre el pabellón auditivo, lo que puede incomodar al acostarse. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 10:21
Initial fit was difficult due to small ear canals, requiring multiple refits. ▶ In Ear Monitors - 64 Audio Review: 10 Years Later @ 7:19
The bone conduction driver is too active and causes uncomfortable vibration in the ears over time. ▶ Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) @ 9:37

Noise Isolation (3)

Isolation is good but not at the level of the best fully sealed IEMs, due to the vented design. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 5:01
MX module has minimal isolation, making it suitable only for quiet environments. ▶ 64 AUDIO U4S, excelso @ 6:09
Using the MX Apex module results in significant low-end roll-off and reduced noise isolation. ▶ 64 Audio U4S IEM Review. A well balanced all-arounder. @ 4:36

Build Quality (2)

The grills meant to prevent wax buildup are difficult to clean and can clog easily, especially for waxy ears. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 2:21
Cleaning tool included does not effectively clean the grills and can cause grills to come off if used too hard. ▶ 64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE @ 2:39

Design (2)

El cono del audífono es recto y no tiene una protuberancia para detener el ear tip, lo que puede ser un detalle a considerar. ▶ 64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? @ 2:05
The interchangeable modules can be easily lost and require careful handling. ▶ O ÁPICE da ENERGIA: 64Audio U4S @ 4:13

Durability (1)

Multiple drivers introduce more points of failure; quality over quantity preferred ▶ NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review @ 1:14

Review sources

64 AUDIO U4S, excelso 21 pros, 6 cons
VOLUR!!! this is... by Gizaudio — 16 pros, 8 cons
64 Audio U4S Review MASTERPIECE S TIER IEM HEADPHONE 17 pros, 6 cons
64 Audio U4S IEM Review. A well balanced all-arounder. by MajorHiFi — 19 pros, 4 cons
NEW EXPENSIVE IEMS? | 64 Audio VOLÜR Review by Joshua Valour — 12 pros, 10 cons
64 Audio U4s Review - The Most Affordable 64 Audio IEM by Headphone Zone — 15 pros, 6 cons
O ÁPICE da ENERGIA: 64Audio U4S by MIND THE HEADPHONE — 14 pros, 7 cons
64 Audio U4S- ¿Vale la pena un audiófono de Gama Alta? by Audio Total — 11 pros, 5 cons
$55 drivers in a $1400 IEM... Is this okay?? by DMS — 8 pros, 8 cons
@64Audio 64audio U4s Review ft. Fibae 5 by Eargasmic — 14 pros, 2 cons
A New PLANAR IEM From 64 Audio!? | 64 Audio Solo Review by Bloom Audio — 10 pros, 4 cons
Flipears Legion Review - I'M SHAKING (Feat. U4S, Supernova) by Praised Audio — 6 pros, 5 cons
In Ear Monitors - 64 Audio Review: 10 Years Later 7 pros, 3 cons
New Custom IEM's 64 Audio A4s Unboxing and First Impressions 9 pros, 0 cons
Checking Out The 64 Audio Aspire 4 IEMs 6 pros, 2 cons
Ranking (almost) ALL the 64 Audio IEMs! Updated for 2025 by The Headphone Show — 6 pros, 1 cons

Frequently asked questions

Is the 64 Audio U4s worth buying?

Based on 16 independent YouTube reviews, the 64 Audio U4s scores 3.9/5 with 191 positive and 77 negative points mentioned by reviewers, placing it #21 in the Wired Earbuds category.

What do reviewers like most about the 64 Audio U4s?

The most praised aspects are sound quality, value for money, comfort — Sound Quality (126 mentions), Value for Money (28 mentions), Comfort (18 mentions).

What are the most common complaints about the 64 Audio U4s?

Reviewers most frequently criticize sound quality, value for money — Sound Quality (49 mentions), Value for Money (14 mentions).

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