Fir Audio M4 VS Dunu Glacier
IEM Comparison: Expert & Community Scores Side-by-Side
Fir Audio M4 and Dunu Glacier use 1DD+3BA and 1DD+4BA+4EST driver setups respectively. Fir Audio M4 costs $1,900 while Dunu Glacier costs $1,350. Fir Audio M4 is $550 more expensive. Dunu Glacier holds a decisive 2.7-point edge in reviewer scores (6 vs 8.7). Dunu Glacier carries a user score of 9. Dunu Glacier has significantly better bass with a 4.5-point edge, Dunu Glacier has significantly better mids with a 2.1-point edge, Dunu Glacier has significantly better treble with a 3.8-point edge, Dunu Glacier has significantly better soundstage with a 3-point edge, Dunu Glacier has significantly better details with a 3.3-point edge and Dunu Glacier has significantly better imaging with a 1.8-point edge.
Insights
| Metric | Fir Audio M4 | Dunu Glacier |
|---|---|---|
| Bass | 4 | 8.5 |
| Mids | 5.5 | 7.6 |
| Treble | 4.5 | 8.3 |
| Details | 5 | 8.3 |
| Soundstage | 7 | 10 |
| Imaging | 6.5 | 8.3 |
| Dynamics | 9.3 | 9.3 |
| Gaming capabilities | 4.6 | 7.6 |
Fir Audio M4 Aggregated Review Score
Fir Audio M4 Average Reviewer Scores
Dunu Glacier Aggregated Review Score
Dunu Glacier Average Reviewer Scores
Fir Audio M4 Details
Driver Configuration: 1DD+3BA
Tuning Type: Warm neutral
Price (Msrp): $1,900
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Dunu Glacier Details
Driver Configuration: 1DD+4BA+4EST
Tuning Type: Harman with bass boost
Price (Msrp): $1,349.99
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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
No user reviews yet. Be the first one who writes a review!
Dunu Glacier User Review Score
Dunu Glacier Average User Scores
Average User Score:
Based on 1 user reviews
9Outstanding
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
CDunu Glacier Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
7.6Gaming Grade
AFir 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.
Dunu Glacier 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
S-- Excellent clarity and detail. Precise imaging and expansive soundstage. Manages complex passages with minimal smearing and good transient speed.
Fir Audio M4 Reviews
Fir Audio M4 reviewed by: Crin
6.5
Reviewer Score
Too similar to the M3 to be worth the price markup. Crin Youtube Channel
Fir Audio M4 reviewed by: Shuwa-T
5.4
Reviewer Score
Comment: Warm and lush midrange. Soundstage is surprisingly wide, midrange focused tuning Note definition is strangely subpar despite treble boost
Dunu Glacier Reviews
Dunu Glacier reviewed by: Z-Reviews
10
* score normalized
The Dunu Glacier delivers an extraordinary premium experience right from the unboxing, featuring a lavish presentation, a massive high-quality fabric cable with interchangeable terminations, and hand-polished stainless steel earpieces that feel substantial and expensive. Despite the controversial MMCX connectors, the cable and fit are praised, complemented by a ton of accessories including multiple ear tip types, a leather case, and even a brush. This is Dunu’s flagship effort at $1300, and the physical presentation screams luxury.
Sonically, the Glacier is a revelation with a massive, immersive soundstage that places instruments at a distance, creating a surround-like experience rather than an in-your-head assault. The tuning is remarkably relaxed and natural, prioritizing smoothness and spatial depth over aggression. Tracks with atmospheric elements or live recordings become breathtaking, revealing layers of echo and venue acoustics that feel expansive and holographic. This isn’t hyper-detailed or clinical; it’s chill, luxurious, and emotionally resonant, making even familiar music feel newly captivating.
Compared to competitors like the Thieaudio Prestige Limited or Monarch MkIII, the Glacier carves its own niche with its unparalleled sense of space and effortless presentation. It doesn’t compete on technical aggression but instead offers a transportive, almost spiritual listening experience. If you crave an endgame IEM that emphasizes grandeur, natural tonality, and pure musical immersion over analytical prowess, the Glacier is a jaw-dropping contender. Just be prepared for its unique, room-filling signature—it’s less an in-ear monitor and more a portal.
Dunu Glacier reviewed by: Super* Review
9*
* score normalized
Convinces me that the harman target can sound excellent.Super* Review original ranking
Super* Review Youtube Channel
The Dunu Glacier stands as the brand's latest flagship tribrid IEM, priced around $1,350. Its standout feature is its adherence to the Harman target curve, a rarity at this level, executed with notable success. The Glacier boasts exceptional build quality, featuring polished 904L stainless steel shells that feel substantial and genuinely premium, justifying its price tag aesthetically. It comes loaded with accessories, including a plethora of ear tips (like the Candy and new clear Dunu Lunnies) and a large carry case, though the case design is noted as slightly awkward. The included cable is thick, well-made, and features Dunu's signature swappable terminations (3.5mm and 4.4mm included), though its ear hooks are somewhat loose and the chin cinch doesn't hold perfectly.
Sonically, the Glacier delivers a contrasty, V-shaped signature true to Harman but avoids the thinness sometimes associated with that target, thanks to extra bass emphasis. The bass is a major highlight – big, impactful, deep, well-textured, and satisfyingly clean with zero bleed into the mids. The treble is forward yet remarkably smooth, avoiding sharpness or sibilance. While technically proficient with good imaging and a strong sense of depth (especially from the bass), it leans slightly more towards contrast than nuanced micro-detail, particularly in the mid-range. Compared to rivals like the 64 Audio U4s (more mid-focused, warmer, laid-back) and the Dunu Mirai (brighter, most mid-focused, wider stage but less satisfying bass and slightly digital/scratchier treble), the Glacier excels in bass impact and separation, smoothness, and depth perception, while the others might appeal more for pure mid-range focus.
Overall, the Dunu Glacier is a highly refined IEM with no glaring weaknesses. Its excellent build, satisfying Harman-tuned sound (especially the standout bass and smooth treble), and competitive technicalities make it a compelling option in the flagship tier. While its weight and aggressive shell molding might cause minor comfort issues when lying down, and the ear hooks could be tighter, it earns a very solid four-star rating for delivering a premium experience that largely justifies its cost and successfully champions the Harman target.
Dunu Glacier reviewed by: Jays Audio
9
Reviewer Score
Clean, balanced sound, clear vocals, great midrange and tech, would rec if not for the unit variance in the tuning, the unit I got sounds different than the earlier ones which was bass-boosted diffuse field Jays Audio Youtube Channel
Dunu Glacier reviewed by: Tim Tuned
7
Reviewer Score
Less thin harman with amazing tech Not very natural timbre Tim Tuned Youtube Channel
Dunu Glacier reviewed by: Precogvision
7.2
Reviewer Score
Quite exciting and dynamic, possibly a bit bright in the treble. Precogvision Youtube Channel
Dunu Glacier reviewed by: Gizaudio Axel
9
Reviewer Score
Reveals every detail in your music, both the good and the bad. Exceptional bass, ethereal treble, remarkable clarity, and outstanding detail. The upper mid-range might be a bit too much for some people.Gizaudio Axel original ranking
Gizaudio Axel Youtube Channel
Dunu Glacier reviewed by: Jaytiss
9.3
Reviewer Score
Upper mids kill it for me, but it's a fun set. Jaytiss Youtube Channel
Priced around $1,350, the Dunu Glacier is a premium nine-driver tribrid IEM featuring one dynamic driver, four balanced armatures, and four electrostatic drivers. The build quality is exceptional with a beautiful mirrored polished steel shell, though it's noted as a bit large, heavy, and a fingerprint magnet. Comfort is generally good, and it includes a high-quality, pliable cable with interchangeable connectors and a secure chin slider. Packaging is also highlighted as exceedingly well done, typical of Dunu's recent standards.
Sonically, the Glacier delivers a very bassy, extremely fun, and highly engaging V-shaped signature. The strong bass is balanced by prominent upper mids, offering good detail resolution and micro-details. However, a noticeable energy peak around 3kHz can make some tracks feel overly energetic, intimate, or even slightly shouty, limiting its versatility for mellower listening sessions. Comparisons place it near sets like the LETSHUOER Tera (less bass, cleaner) and ThieAudio Monarch MK I (less bass, more even upper mids), while noting it surpasses the Dunu Brain Dance (DK-31) in detail and bombast, though the Brain Dance offers significant value at half the price.
Ultimately, the Dunu Glacier stands out as a fantastic and unique IEM with satisfying bass weight, good imaging, and excellent micro-details. Its fun, bombastic character and high-quality build make it a compelling choice, but the specific upper-mid energy requires careful consideration. It earns a recommendation for those seeking an ultra-engaging Harman-style listen with top-tier driver tech, though demoing is advised due to its distinct tonal quirks.
Dunu Glacier reviewed by: IEMRanking AI
2025-07-02
9
Reviewer Score
The Dunu Glacier delivers a technically impressive listening experience with its nine-driver tribrid setup (1DD+4BA+4EST). The stainless steel shells feel substantial yet remain comfortable for extended sessions despite their weight. Sonically, it presents a Harman-inspired tuning enhanced by significant sub-bass rumble and a notably wide soundstage, creating an expansive presentation.
Bass response is a standout, offering deep, textured rumble and strong physical impact thanks to the biocellulose dynamic driver, while the four EST drivers provide highly detailed treble without harshness. However, the upper mids can occasionally feel intense or forward on certain tracks, and the midrange sometimes exhibits a slight hollowness, making it less forgiving of poor recordings. While the soundstage width is exceptional under $2000, depth and layering don’t quite reach the absolute top tier.
At $1349, the Glacier justifies its price with a premium unboxing experience, including a versatile modular cable, multiple high-quality eartip options (Dunu S&S, Candy, SpinFit), and a distinctive design. It’s a strong choice for those seeking a dynamic, detailed signature with thunderous bass and a vast stage, though its revealing nature and shell size may not suit all listeners or genres.
Fir Audio M4 User Reviews
"This is an example review"
Pros
- Example pro 1
- Example pro 2
Cons
- Example con 1
- Example con 2
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You need to be signed in to write your own reviewDunu Glacier User Reviews
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You need to be signed in to write your own reviewLuxury looking IEM with great sound quality. Sounds best with Tangzu Sancai tips
Pros
Sounds fun and clean at the same time, very engaging. Insane soundstage and 3D-holographic effect.Cons
In some songs too energetic for long listening sessions.Buy Dunu Glacier on Aliexpress
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