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
64 Audio U4s Aggregated Review Score
Average Reviewer Scores
Sony IER-M9 Details
Driver Configuration: 5BA
Tuning Type: Warm neutral
Brand: Sony Top Sony IEMs
Price (Msrp): $1,000
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64 Audio U4s Details
Driver Configuration: 1DD+3BA
Tuning Type: neutral, bass-boosted neutral
Brand: 64 Audio Top 64 Audio IEMs
Price (Msrp): $1,100
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Sony IER-M9 User Review Score
Average User Scores
Average User Score:
Based on 1 user reviews
7.5Strongly Favorable
64 Audio U4s User Review Score
Average User Scores
Average User Score: n/a
Based on 0 user reviews
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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
6.3Gaming Grade
B64 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
6.1Gaming Grade
BSony 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.
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.
Sony IER-M9 Reviews
Reviewed by: Audionotions
Reviewed by: Precogvision
Precogvision Youtube Channel
Reviewed by: Tim Tuned
Tim Tuned Youtube Channel
Reviewed by: Crin
Crin Youtube Channel
64 Audio U4s Reviews
Reviewed by: Super* Review
Reviewed by: Audionotions
Reviewed by: Smirk Audio
Reviewed by: Jaytiss
Jaytiss Youtube Channel
Reviewed by: Precogvision
Precogvision Youtube Channel
Sony IER-M9 User Reviews
Share your experience and build your personal ranking list.
You need to be signed in to write your own reviewWorth 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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Pros
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Cons
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