Sony IER-M9 VS 64 Audio U4s

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

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Sony IER-M9 and 64 Audio U4s use 5BA and 1DD+3BA driver setups respectively. Sony IER-M9 costs $1,000 while 64 Audio U4s costs $1,100. 64 Audio U4s is $100 more expensive. 64 Audio U4s holds a clear 0.8-point edge in reviewer scores (7.4 vs 8.2). Sony IER-M9 carries a user score of 7.5. 64 Audio U4s has better bass with a 0.5-point edge, Sony IER-M9 has better treble with a 0.7-point edge, 64 Audio U4s has significantly better dynamics with a 2.7-point edge, Sony IER-M9 has better details with a 0.8-point edge and 64 Audio U4s has better imaging with a 0.5-point edge.

Insights

Metric Sony IER-M9 64 Audio U4s
Bass 7.5 8
Mids 8 7.8
Treble 7.5 6.8
Details 8 7.3
Soundstage 7.4 6
Imaging 7 7.5
Dynamics 5 7.7
Tonality 7.1 7.4
Technicalities 7.4 7

Sony IER-M9 Aggregated Review Score

Average Reviewer Scores

Precogvision Tim Tuned Crin
Audionotions

Average Reviewer Score:

7.4

Generally Favorable


64 Audio U4s Aggregated Review Score

Average Reviewer Scores

Smirk Audio Jaytiss Precogvision
Audionotions
Super* Review

Average Reviewer Score:

8.2

Very Positive


Sony IER-M9 User Review Score

Average User Scores

Average User Score:

Based on 1 user reviews

7.5

Strongly Favorable

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!

Sony IER-M9 Gaming Score

Gaming Score & Grade

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

Gaming Score

6.3

Gaming Grade

B

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

Sony IER-M9 Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • Pleasing tonal balance with good technical control. Minor quirks present but not distracting. Demonstrates decent genre versatility.

Average Technical Grade

A-
  • Competent technical presentation. Handles separation and detail well in most tracks, with modest soundstage and acceptable imaging capabilities.
Bass A
Strong, well-defined bass with good texture. Delivers satisfying punch and rumble without overwhelming other frequencies.
Mids A+
Superb midrange that's rich and resolving. Exceptional transparency and micro-details with perfect vocal/instrument balance.
Treble A
Excellent treble: airy, extended and well-controlled. Great micro-detail retrieval without sibilance or harshness.
Dynamics C+
Decent dynamic performance. Good macro-contrast but micro-dynamics could be more nuanced. Satisfactory impact.
Details A+
Exceptional resolution that uncovers the deepest layers. Retrieves even the most minute details while maintaining natural timbre.
Imaging A-
Excellent imaging: precise and stable placement. Instruments occupy specific points in space with tangible positions.
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

64 Audio U4s Scorings

Average Technical & Tuning Grades

Average Tunign Grade

A-
  • Pleasing tonal balance with good technical control. Minor quirks present but not distracting. Demonstrates decent genre versatility.

Average Technical Grade

A-
  • Competent technical presentation. Handles separation and detail well in most tracks, with modest soundstage and acceptable imaging capabilities.
Bass A+
Excellent bass response - powerful yet controlled. Deep extension with authoritative slam while maintaining clarity.
Mids A
Excellent midrange with natural timbre and great detail retrieval. Vocals are forward and emotive with lifelike instrument reproduction.
Treble B+
Good treble response - clear and detailed without fatigue. Well-extended with proper air and sparkle.
Dynamics A
Excellent dynamics with great contrast and speed. Transients are crisp and micro-details are clearly articulated.
Soundstage B
Good soundstage with proper width and depth. Instruments have clear positioning with reasonable front/back placement.
Details A-
Excellent detail retrieval: highly resolving without being clinical. Effortlessly reveals micro-details and textural subtleties.
Imaging A
Excellent imaging: precise and stable placement. Instruments occupy specific points in space with tangible positions.
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

Sony IER-M9 Reviews

Reviewed by: Audionotions

Audionotions 8 Reviewer Score
Nice note weight, very balanced, shockingly good at imaging held back by finicky fit and vacuum seal - fit issues can be resolved by changing tips though (for me the stock silicone LL tips eliminated fit issues for me but YMMV). At used prices today, it's a steal. Previously Owned

Audionotions original ranking

Website (Audionotions)

Reviewed by: Precogvision

Precogvision 7.4 Reviewer Score
A- Tuning
B+ Tech
Boring, but you won't find anything more well-rounded for the price. Exceptional timbre for a BA IEM.

Precogvision original ranking

Precogvision Youtube Channel
Bass: A- Mids: A+ Treble: A- Dynamics: C+ Details: A+ Imaging: A-

Reviewed by: Tim Tuned

Tim Tuned 7 Reviewer Score
A- Tuning
A+ Tech
Just great accross the board, nothing to fault Not very special

Tim Tuned original ranking

Tim Tuned Youtube Channel
Bass: A+ Mids: A+ Treble: A+

Reviewed by: Crin

Crin 7 Reviewer Score
A- Tuning
A Tech
Neutral tonality, highly coherent and decent detail pickup. The all-rounder of the IER lineup.

Crin original ranking

Crin Youtube Channel

64 Audio U4s Reviews

Reviewed by: Super* Review

Super* Review 9* * score normalized
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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. Previously Owned

Audionotions original ranking

Website (Audionotions)

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+

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

Reviewed by: Precogvision

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

Precogvision original ranking

Precogvision Youtube Channel
Bass: A+ Mids: A+ Treble: A- Dynamics: A+ Details: A- Imaging: A-

Sony IER-M9 User Reviews

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Makavelian
7.5

Worth it at used prices for neutral warm all rounder.

Pros
Great all rounder tuning, imaging, comfort.
Cons
Bit lacking in engagement, bass typical of BA drivers.

64 Audio U4s User Reviews

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