Thieaudio Monarch MK3 VS Symphonium Helios SE
IEM Comparison: Expert & Community Scores Side-by-Side
Thieaudio Monarch MK3 and Symphonium Helios SE use 2DD+6BA+2EST and 4BA driver setups respectively. Thieaudio Monarch MK3 costs $1,000 while Symphonium Helios SE costs $1,150. Symphonium Helios SE is $150 more expensive. Thieaudio Monarch MK3 holds a slight 0.1-point edge in reviewer scores (8.1 vs 8). Thieaudio Monarch MK3 carries a user score of 6.8. Thieaudio Monarch MK3 has better bass with a 0.5-point edge, Symphonium Helios SE has slightly better mids with a 0.3-point edge, Symphonium Helios SE has slightly better treble with a 0.3-point edge, Thieaudio Monarch MK3 has slightly better dynamics with a 0.3-point edge and Symphonium Helios SE has slightly better details with a 0.3-point edge.
Insights
| Metric | Thieaudio Monarch MK3 | Symphonium Helios SE |
|---|---|---|
| Bass | 7.5 | 7 |
| Mids | 7.7 | 8 |
| Treble | 7.8 | 8 |
| Details | 7.8 | 8 |
| Soundstage | 8 | 8 |
| Imaging | 7.4 | 7.5 |
| Dynamics | 7.3 | 7 |
| Tonality | 7.8 | 7.9 |
| Technicalities | 7.8 | 7.9 |
Thieaudio Monarch MK3 Aggregated Review Score
Average Reviewer Scores
Symphonium Helios SE Aggregated Review Score
Average Reviewer Scores
Thieaudio Monarch MK3 Details
Driver Configuration: 2DD+6BA+2EST
Tuning Type: U-Shaped
Brand: ThieAudio Top ThieAudio IEMs
Price (Msrp): $1,000
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Symphonium Helios SE Details
Driver Configuration: 4BA
Tuning Type: n/a
Brand: Symphonium Top Symphonium IEMs
Price (Msrp): $1,150
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Thieaudio Monarch MK3 User Review Score
Average User Scores
Average User Score:
Based on 1 user reviews
6.8Cautiously Favorable
Symphonium Helios SE 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!
Thieaudio Monarch MK3 Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
7.5Gaming Grade
ASymphonium Helios SE 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+Thieaudio Monarch MK3 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A- Well-executed tonal character. No major flaws with good technical control. Smooth presentation works with multiple genres.
Average Technical Grade
A- Good technical performance. Clear separation and decent detail retrieval across various tracks. Soundstage shows reasonable width and depth.
Symphonium Helios SE Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A- Well-executed tonal character. No major flaws with good technical control. Smooth presentation works with multiple genres.
Average Technical Grade
A- Good technical performance. Clear separation and decent detail retrieval across various tracks. Soundstage shows reasonable width and depth.
Thieaudio Monarch MK3 Reviews
10
* score normalized
8.5
Reviewer Score
Better low-end texture and overall more engaging than MK2, but lacks the mid-range/vocal magic, so depending on your preference either is great. Still TOTL tech like MK2. Great all-rounder. Jays Audio Youtube Channel
8.5
Reviewer Score
Fatiging at times for me, too fun at times. Jaytiss Youtube Channel
8.2
Reviewer Score
Better bass response compared to the mk2 Trades off the lush midrange in place of a cleaner sounding, almost boring midrange
8
Reviewer Score
I prefer the Monarch MK II for its tonality, vocals, and timbre, but I get why some prefer the MK III. More bass, treble, and detail than the Monarch MK II. The vocal magic of the Monarch MK II is gone.Gizaudio Axel original ranking
Gizaudio Axel Youtube Channel
7.9
Reviewer Score
Elevated, well-textured mid-bass. Pleasant mids. Elevated upper-treble may be pesky to some.
Tim Tuned
2025-08-14
7.5
Reviewer Score
MK2 but more fun and more V-shape Not as natural in timbre Tim Tuned Youtube Channel
7.3
Reviewer Score
Still perplexingly poor bass performance, but improves upon the Monarch MKII's treble extension noticeably. Precogvision Youtube Channel
7.1
Reviewer Score
An improvement in the bass and treble department over the Mk2, but without the same special sauce in the mid-range and with some imaging problems still.
7*
* The score of this reviewer influences only the Gaming Score
Symphonium Helios SE Reviews
8.5
Reviewer Score
Best Treble around it's price. Super airy but still smooth. Bass-scoop isn't as bad as I thought, but those who want mid-bass - avoid it. Jays Audio Youtube Channel
8.1
Reviewer Score
Limited to 50 units. A huge improvement fit wise versus the original. Great TOTL all-rounder. Great sub, upper mids and treble. Mid-bass is an improvement but still not boosted. Great technical chops while fixing the sense of plasticness the original had.
7.4
Reviewer Score
See Helios but with more mid-treble and mid-bass. Precogvision Youtube Channel
Thieaudio Monarch MK3 User Reviews
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Pros
Detail retrievalCons
Recessed mids and odd timbre.Symphonium Helios SE User Reviews
"This is an example review"
Pros
- Example pro 1
- Example pro 2
Cons
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