Fir Audio M4 and Symphonium Crimson use 1DD+3BA and 4BA driver setups respectively. Fir Audio M4 costs $1,900 while Symphonium Crimson costs $1,500. Fir Audio M4 is $400 more expensive. Symphonium Crimson holds a decisive 2.5-point edge in reviewer scores (6 vs 8.4). Symphonium Crimson has significantly better bass with a 4.6-point edge, Symphonium Crimson has significantly better mids with a 2.4-point edge, Symphonium Crimson has significantly better treble with a 3.2-point edge, Symphonium Crimson has significantly better soundstage with a 1.8-point edge, Symphonium Crimson has significantly better details with a 3.1-point edge and Symphonium Crimson has significantly better imaging with a 2-point edge.
Insights
Metric | Fir Audio M4 | Symphonium Crimson |
---|---|---|
Bass | 4 | 8.6 |
Mids | 5.5 | 7.9 |
Treble | 4.5 | 7.7 |
Details | 5 | 8.1 |
Soundstage | 7 | 8.8 |
Imaging | 6.5 | 8.5 |
Dynamics | 7.3 | 7.3 |
Gaming capabilities | 4.6 | 7.3 |
Fir Audio M4 Aggregated Review Score
Fir Audio M4 Average Reviewer Scores
Symphonium Crimson Aggregated Review Score
Symphonium Crimson Average Reviewer Scores
Fir Audio M4 Details
Driver Configuration: 1DD+3BA
Tuning Type: Warm neutral
Price (Msrp): $1,900
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Symphonium Crimson Details
Driver Configuration: 4BA
Tuning Type: U-Shaped
Price (Msrp): $1,500
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Fir Audio M4 User Review Score
Fir Audio M4 Average User Scores
Average User Score: n/a
Based on 0 user reviews
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Symphonium Crimson User Review Score
Symphonium Crimson Average User Scores
Average User Score: n/a
Based on 0 user reviews
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Fir Audio M4 Gaming Score

Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
4.6Gaming Grade
CSymphonium Crimson Gaming Score

Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
7.3Gaming Grade
A-Fir Audio M4 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
B-- Generally enjoyable tonal character with some noticeable unevenness. Maintains listenability while showing room for refinement in frequency balance.
Average Technical Grade
B- Satisfactory technical performance. Handles basic detail retrieval adequately in most tracks. Maintains reasonable cohesion in simpler arrangements.
Symphonium Crimson 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+- Very competent with articulate presentation. Well-defined layers and precise imaging. Soundstage is immersive and handles dynamics well.
Fir Audio M4 Reviews
Fir Audio M4 reviewed by: Crin
Too similar to the M3 to be worth the price markup. Crin Youtube Channel
Fir Audio M4 reviewed by: Shuwa-T
Comment: Warm and lush midrange. Soundstage is surprisingly wide, midrange focused tuning Note definition is strangely subpar despite treble boost
Symphonium Crimson Reviews
Symphonium Crimson reviewed by: Z-Reviews
Symphonium Crimson reviewed by: Precogvision
Colored tonality done correctly with incredible bass and dynamics. Upper-treble can be slightly too zingy depending on source. Precogvision Youtube Channel
Symphonium Crimson reviewed by: Smirk Audio
Excellent bass, dynamics, and resolution. Very large soundstage with great imaging. Mid/upper-treble may be too elevated for some.
Symphonium Crimson reviewed by: Jays Audio
U-shaped/Slight V/W Shaped. Energetic treble. Great tech. Fun signature. Jays Audio Youtube Channel
Symphonium Crimson reviewed by: Jaytiss
Suffers from BA bass, and super Zingie Treble. Jaytiss Youtube Channel
Symphonium Crimson reviewed by: Shuwa-T
The bassier Helios with no sacrifices to clarity
Symphonium Crimson reviewed by: Nymz
Great bass, holographic stage and top of the shelf dynamics. Probably my favourite rendition of a W-shaped tuning to this date. Treble might be spicy for some, but using Divinus Velvets (stock black) seem to help a lot.
Fir Audio M4 User Reviews
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