Faudio Dark Sky VS 64 Audio U4S

IEM Comparison: Expert & Community Scores Side-by-Side

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Faudio Dark Sky and 64 Audio U4S use 1DD and 1DD+3BA driver setups respectively. Faudio Dark Sky costs $1,150 while 64 Audio U4S costs $1,100. Faudio Dark Sky is $50 more expensive. 64 Audio U4S holds a decisive 1.5-point edge in reviewer scores (6.6 vs 8.1). 64 Audio U4S has significantly better bass with a 2-point edge, 64 Audio U4S has significantly better mids with a 2.8-point edge, 64 Audio U4S has significantly better treble with a 2.3-point edge, 64 Audio U4S has significantly better details with a 1.3-point edge and 64 Audio U4S has significantly better imaging with a 1.5-point edge.

Insights

Metric Faudio Dark Sky 64 Audio U4S
Bass 6 8
Mids 5 7.8
Treble 4.5 6.8
Details 6 7.3
Soundstage 6 6
Imaging 6 7.5
Dynamics 6.6 7.7
Tonality 6.1 7.4
Technicalities 6.2 7
Take these comparisons with a grain of salt—we don't have enough Faudio Dark Sky reviews saved yet to provide an unbiased result.

Faudio Dark Sky Aggregated Review Score

Average Reviewer Scores

Precogvision Shuwa-T
Crin
Head-Fi.org

Average Reviewer Score:

6.6

Cautiously Favorable

64 Audio U4S Aggregated Review Score

Average Reviewer Scores

Smirk Audio Jaytiss Precogvision
Audionotions Head-Fi.org
Super* Review

Average Reviewer Score:

8.1

Very Positive

Reviews Comparison

Faudio Dark Sky reviewed by Precogvision

Precogvision 5.6 Reviewer Score
B Tuning
B Tech
5kHz runs slightly hot and technicalities aren't enough to push it above the single-DD competition.

Precogvision original ranking

Precogvision Youtube Channel

64 Audio U4S reviewed by Precogvision

Precogvision 7.7 Reviewer Score
A Tuning
A- Tech
YouTube video thumbnail
Fantastic colored tonality with options, and the unique technical qualities to back it up. M12/M15 modules recommended.
Youtube Video Summary

The 64 Audio U4s hits a compelling sweet spot: a 1DD+3BA hybrid around $1,100 that echoes the lush, bass-tilted character of the Nio while fixing key drawbacks. Packaging and accessories feel improved, with multiple tip options and the included M12 APEX module; APEX not only tailors bass but also relieves pressure for long sessions. Fit follows 64 Audio’s comfortable triangular shell; the vented DD asks for a slightly shallower insert than the all-BA models. Sonically, expect a sub-bass-oriented shelf and a treble profile that’s more lively and “zingy” than the Nio, with extra energy around the upper treble. The big caveat is 64 Audio’s muted 2–4 kHz region, which can set soprano vocals a step back on the stage.

Against the brand’s full-BA staples (think U12t/U6t), the U4s trades some pinpoint imaging and coherency for unmistakable DD slam and tactile “air pushing.” Extension at both ends is excellent, with upper-treble energy that makes micro-detail and reverb trails pop. It’s not the clean, conventional neutrality of something like a Monarch-style tuning; rather, it’s a deliberate, colored signature that delivers fun plus technical chops. Crucially, it fills a missing niche at its price and, in many respects, outperforms the pricier Nio, making the U4s a standout recommendation for listeners who want bass authority, sparkle, and engaging dynamics without going all-in on the flagship tier.

Bass: A+ Mids: A+ Treble: A- Dynamics: A+ Details: A- Imaging: A-

Precogvision original ranking

Precogvision Youtube Channel

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Faudio Dark Sky reviewed by Head-Fi.org

Head-Fi.org 8.7 * score rescaled + normalized
5 community members have rated the FAudio Dark Sky at an average of 4.6/5 on Head-Fi. Overall sentiment: Outstanding.

URL to full Review

Head-Fi.org original ranking

64 Audio U4S reviewed by Head-Fi.org

Head-Fi.org 8 * score rescaled + normalized
4 community members have rated the 64 Audio U4s at an average of 4.3/5 on Head-Fi. Overall sentiment: Excellent.

URL to full Review

Head-Fi.org original ranking

Faudio Dark Sky (more reviews)

Faudio Dark Sky reviewed by Crin

Crin 6.5 Reviewer Score
A- Tuning
B+ Tech
check links for more info:

Crin original ranking

Crin Youtube Channel

Faudio Dark Sky reviewed by Shuwa-T

Shuwa-T 5.6 Reviewer Score
C+ Tuning
B Tech
Comment: Expensive but not justified. Bass-oriented, good treble extension It's not great bass, treble is splashy yet not well defined

Shuwa-T original ranking

Shuwa-T Website

Bass: B Mids: C+ Treble: C Soundstage: B Details: B Imaging: B

64 Audio U4S (more reviews)

64 Audio U4S reviewed by Super* Review

Super* Review 9* * score rescaled + normalized
YouTube video thumbnail
Youtube Video Summary

The 64 Audio U4s hits a compelling sweet spot: a 1DD+3BA hybrid around $1,100 that echoes the lush, bass-tilted character of the Nio while fixing key drawbacks. Packaging and accessories feel improved, with multiple tip options and the included M12 APEX module; APEX not only tailors bass but also relieves pressure for long sessions. Fit follows 64 Audio’s comfortable triangular shell; the vented DD asks for a slightly shallower insert than the all-BA models. Sonically, expect a sub-bass-oriented shelf and a treble profile that’s more lively and “zingy” than the Nio, with extra energy around the upper treble. The big caveat is 64 Audio’s muted 2–4 kHz region, which can set soprano vocals a step back on the stage.

Against the brand’s full-BA staples (think U12t/U6t), the U4s trades some pinpoint imaging and coherency for unmistakable DD slam and tactile “air pushing.” Extension at both ends is excellent, with upper-treble energy that makes micro-detail and reverb trails pop. It’s not the clean, conventional neutrality of something like a Monarch-style tuning; rather, it’s a deliberate, colored signature that delivers fun plus technical chops. Crucially, it fills a missing niche at its price and, in many respects, outperforms the pricier Nio, making the U4s a standout recommendation for listeners who want bass authority, sparkle, and engaging dynamics without going all-in on the flagship tier.

Super* Review original ranking

Super* Review Youtube Channel

64 Audio U4S reviewed by Audionotions

Audionotions 8.5 Reviewer Score
A step down in techs from U12T (possibly a half step down from U6T). But very well tuned and adds in a dynamic driver punch. Timbre is slightly improved compared to U12T due to the increase in midbass and upper mids energy. On the second hand market, 64Audio IEMs are among the best values in portable audio, the U4S is no exception.

Audionotions original ranking

Website (Audionotions)

64 Audio U4S reviewed by Smirk Audio

Smirk Audio 7.8 Reviewer Score
A Tuning
A Tech
A tastefully colored U12t with a more intimate soundstage, a cutback in technicalities, and more bass realism.

Smirk Audio original ranking

Smirk Audio Head-Fi Profile

Bass: A+ Mids: A Treble: A Dynamics: A+ Details: A Imaging: A+

64 Audio U4S reviewed by Jaytiss

Jaytiss 7.8 Reviewer Score
B+ Tuning
B Tech
It's a solid set, with great build quality, but sonically isn't the specialist that I want it to be.

Jaytiss original ranking

Jaytiss Youtube Channel
Mids: A+ Treble: B Dynamics: A- Soundstage: B

Faudio Dark Sky User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

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64 Audio U4S User Review Score

Average User Scores

Average User Score: n/a

Based on 0 user reviews

No user reviews yet. Be the first one who writes a review!

Faudio Dark Sky Gaming Score

Gaming Score & Grade

  • The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.

Gaming Score

5.1

Gaming Grade

C+

64 Audio U4S Gaming Score

Gaming Score & Grade

  • The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.

Gaming Score

6.1

Gaming Grade

B

Faudio Dark Sky Scorings

Average Technical & Tuning Grades

Average Tunign Grade

B
  • Expect a friendly tonal balance that could use polish but remains inviting. Great for casual listening, less so for purists.

Average Technical Grade

B
  • Technical ability is serviceable, keeping basic detail intact across simpler tracks. It keeps up with acoustic tracks without much fuss.
Bass B
Bass foundation is good, adding satisfying punch without losing control. Pop and rock tracks feel lively.
Mids C+
Midrange performance is decent, offering balanced presence without major flaws. It works well for casual background listening.
Treble C
Treble is adequate overall, though its texture can feel coarse. Longer sessions may expose grain.
Soundstage B
The presentation supplies a believable venue outline where each instrument owns its pocket of space. The stage opens up nicely for live cuts.
Details B
Nuance retrieval becomes reliable, highlighting expressive touches in every instrument. It rewards attentive listening.
Imaging B
Depth cues step forward, giving performances a dimensional presence. Front-to-back cues become more immersive.
Gaming C+
Fundamental left/right positioning with limited depth perception. Works for non-competitive gaming but lacks precision. Bad value-to-cost for gaming purpose - not recommended

64 Audio U4S Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • A smooth, agreeable balance keeps the presentation engaging without obvious flaws. Only sensitive ears will nitpick the bumps.

Average Technical Grade

A-
  • Technical chops are reliable, pairing tidy separation with a soundstage that stays conservative. Micro-detail is decent, though never spotlighted.
Bass A+
Expect a gripping low-end presence that marries clarity with visceral impact. Dynamic swings land with thrilling force.
Mids A
Midrange performance is excellent, with natural timbre and great detail. Vocals feel lifelike and full-bodied.
Treble B+
Expect crisp, well-balanced treble that keeps shimmer intact. You hear reverbs decay naturally.
Dynamics A
You get outstanding dynamic agility, from subtle nuances to big hits. Impact comes with quick recovery.
Soundstage B
Good soundstage with proper width and depth, placing instruments in clearly defined positions. Instruments sit in their own lanes.
Details A-
Resolution feels both high and relaxed, capturing nuance with ease. There's zero smearing even at high volume.
Imaging A
Depth mapping feels natural and accurate, supporting convincing immersion. Depth mapping feels precise and natural.
Gaming B
Decent spatial awareness for fundamental positioning. Creates satisfying atmosphere in story-driven games while handling basic directional cues. Bad value-to-cost for gaming purpose - not recommended

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