Thieaudio Monarch Mk2 and 64 Audio U4s use 1DD+6BA+2EST and 1DD+3BA driver setups respectively. Thieaudio Monarch Mk2 costs $1,000 while 64 Audio U4s costs $1,100. 64 Audio U4s is $100 more expensive. 64 Audio U4s holds a slight 0.2-point edge in reviewer scores (8 vs 8.2). 64 Audio U4s has significantly better bass with a 1.2-point edge, Thieaudio Monarch Mk2 has better mids with a 0.6-point edge, Thieaudio Monarch Mk2 has better treble with a 0.7-point edge, 64 Audio U4s has significantly better dynamics with a 1.2-point edge, Thieaudio Monarch Mk2 has significantly better soundstage with a 2-point edge and Thieaudio Monarch Mk2 has slightly better details with a 0.4-point edge.
Insights
Metric | Thieaudio Monarch Mk2 | 64 Audio U4s |
---|---|---|
Bass | 6.8 | 8 |
Mids | 8.4 | 7.8 |
Treble | 7.5 | 6.8 |
Details | 7.6 | 7.3 |
Soundstage | 8 | 6 |
Imaging | 7.4 | 7.5 |
Dynamics | 6.5 | 7.7 |
Tonality | 8 | 7.4 |
Technicalities | 7.8 | 7 |
Thieaudio Monarch Mk2 Aggregated Review Score
Average Reviewer Scores
64 Audio U4s Aggregated Review Score
Average Reviewer Scores
Thieaudio Monarch Mk2 Details
Driver Configuration: 1DD+6BA+2EST
Tuning Type: bass-boosted neutral
Brand: ThieAudio Top ThieAudio 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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Thieaudio Monarch Mk2 User Review Score
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64 Audio U4s User Review Score
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Thieaudio Monarch Mk2 Gaming Score

Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
6.9Gaming 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
6.1Gaming Grade
BThieaudio Monarch Mk2 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A+- Refined execution with coherent frequency integration. Natural timbre reproduction and engaging presentation. Strong versatility.
Average Technical Grade
A- Good technical performance. Clear separation and decent detail retrieval across various tracks. Soundstage shows reasonable width and depth.
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.
Thieaudio Monarch Mk2 Reviews
Neutral tuning with one of the clearest mid-ranges. Natural and clean vocals. Great resolution, separation, and detail. Can be a little dry with its analytical presentation. Bass is well-seperated from other instruments, but nothing special especially at $1K. Would've liked more depth, and treble is also a bit unstable and dips, resulting in a lack of air/depth. Mid-bass is just enough for my library, but would've liked more for genres like hiphop and rock. Cable is heavy, and fit may be too big for many (need to shove in deep). Jays Audio Youtube Channel
Too much unit variation to recommend to others highly. Jaytiss Youtube Channel
Outstanding tuning. Smooth, balanced tuning with natural vocals, beautiful timbre, and excellent tonality. Detail and could use more bass. Treble depends on ear tips.Gizaudio Axel original ranking
Gizaudio Axel Youtube Channel
Organic midrange Wooly bass response and less prominent treble may not work best for certain genres
Good treble with tons of air. Forward, ethereal mids. Good detail retrieval with tons of microdetails. Lackluster mid-bass.
Cohesive, smooth, balanced, technical slight treble wispiness Tim Tuned Youtube Channel
11/10 mid-range. Mid-bass could use more texture and stage depth could be better. Yap, that's all. Oh and the fit - I'm blessed, but you may not be.
A solid improvement in imaging with slightly more palatable tonality than its predecessor. Precogvision Youtube Channel
64 Audio U4s Reviews
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
A tastefully colored U12t with a more intimate soundstage, a cutback in technicalities, and more bass realism.
It's a solid set, with great build quality, but sonically isn't the specialist that I want it to be. Jaytiss Youtube Channel
Fantastic colored tonality with options, and the unique technical qualities to back it up. M12/M15 modules recommended. Precogvision Youtube Channel
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