JUZEAR x Z Reviews Defiant VS Fosi Audio IM4
IEM Comparison: Expert & Community Scores Side-by-Side
JUZEAR x Z Reviews Defiant and Fosi Audio IM4 use 1DD+3BA and 1DD (10mm beryllium-coated) driver setups respectively. JUZEAR x Z Reviews Defiant costs $100 while Fosi Audio IM4 costs $99. JUZEAR x Z Reviews Defiant is $1 more expensive. JUZEAR x Z Reviews Defiant holds a decisive 1-point edge in reviewer scores (7.3 vs 6.3). JUZEAR x Z Reviews Defiant carries a user score of 5.7. JUZEAR x Z Reviews Defiant has significantly better mids with a 2-point edge, JUZEAR x Z Reviews Defiant has significantly better dynamics with a 1-point edge and JUZEAR x Z Reviews Defiant has significantly better soundstage with a 1-point edge.
Insights
| Metric | JUZEAR x Z Reviews Defiant | Fosi Audio IM4 |
|---|---|---|
| Mids | 7 | 5 |
| Treble | 5 | 5 |
| Soundstage | 6 | 5 |
| Dynamics | 7 | 6 |
| Tonality | 6.3 | 5.3 |
| Technicalities | 5 | 5 |
Jaytiss Reviews Comparison
JUZEAR x Z Reviews Defiant reviewed by
7.3
Reviewer Score
Youtube Video Summary
The JUZEAR x Z Reviews Defiant is a 1DD/3BA hybrid IEM that boasts a solid build quality with a comfortable, vented shell and a metallic nozzle that holds ear tips well. It comes with a modular cable that can be switched to a 4.4mm connector and a set of decent accessories, including a case that is described as nothing extraordinary but is overall quite nice. The physical package is reliable and functional, providing a good foundation for the experience.
Where the Defiant truly shines is in its fantastic tonality and tuning. It delivers a bassy and engaging sound with good treble that never gets too shouty or harsh, making it an excellent choice for long listening or gaming sessions. The graph shows it follows a very competent target curve quite closely, resulting in an all-around solid and highly enjoyable sound signature that is both relaxing and engaging without major faults.
Priced at around $100, the Defiant is deemed a highly competitive offering in its segment. It goes head-to-head with other popular sets like the Letshuoer S08 Planar and the 7Hz Aeroso, trading blows depending on whether one prefers a hybrid or planar driver presentation. While it may not have the absolute best treble extension and isn't going to "light the world on fire," it represents a great value with its excellent tuning, making it an easy set to recommend for anyone seeking a fun, well-tuned, and comfortable IEM.
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Fosi Audio IM4 reviewed by
2025-10-16
6.3
Reviewer Score
Youtube Video Summary
Fosi Audio IM4 brings a beryllium-coated single DD in a compact shell with thoughtful venting that behaves almost open-back for comfort during long sessions. Build is surprisingly premium for ~$100: a small, well-finished nozzle that grips tips, a light but durable cable with color-coded channels and a working chin slider, a tidy case, and tuning nozzles (black/gold) plus multiple tips. It’s the kind of fit and finish usually saved for pricier sets.
Tonally, this is an engaging, warm-rich tuning with elevated sub-bass, good texture, and plenty of detail—not a neutral reference. There’s energy in the 2–4 kHz region and a bit of 5–6 kHz bite that can read as “cat-ear” presence, trading strict smoothness for extra soundstage perception and clarity. Versus the many neutral options at this price, IM4 feels more characterful and fun; think closer to sets that use a staged upper-mid/treble contour than to flat targets. Filters/foams or a touch of EQ can gently tame peaks while keeping the lively character.
On the scoreboard: bass 7/10 (clean shelf and punch), mids a touch recessed versus a neutral target, treble lively with agreeable detail, and stage/detail notably good for the class. Overall, a well-built, fun, and slightly audiophile-tuned single-DD that will appeal to listeners who value texture and excitement over strict neutrality—plus rare build quality and extras at this price make it a solid value.
Jaytiss Youtube Channel
JUZEAR x Z Reviews Defiant Details
Driver Configuration: 1DD+3BA
Tuning Type: V-Shaped
Brand: Juzear Top Juzear IEMs
Price (Msrp): $99.99
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Fosi Audio IM4 Details
Driver Configuration: 1DD (10mm beryllium-coated)
Tuning Type: Neutral
Price (Msrp): $99
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JUZEAR x Z Reviews Defiant Scorings
Average Technical & Tuning Grades
Average Tunign Grade
B- Expect a friendly tonal balance that could use polish but remains inviting. Great for casual listening, less so for purists.
Average Technical Grade
C+- An honest, middle-of-the-road performance preserves structure without chasing micro-detail. It's respectable for everyday listening sessions.
Fosi Audio IM4 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
C+- The tuning leans easygoing, yet occasional unevenness nudges it away from greatness. A bit of EQ polish can smooth things nicely.
Average Technical Grade
C+- Overall technicalities are acceptable, delivering enough clarity for casual sessions. Imaging is serviceable though not immersive.
JUZEAR x Z Reviews Defiant User Reviews
Share your experience and build your personal ranking list.
You need to be signed in to write your own reviewThrilling bass-forward performer with impressive technicalities at its price point, though not for neutral seekers.
Pros
Excellent bass texture with powerful slam, premium build quality and comfortable fit. Engaging V-shaped tuning ideal for energetic genres.Cons
Upper mids occasionally sharp with certain tracks, average isolation for noisy environments.Defying my sanity
Pros
Great fit, detailed midsCons
Average soundstage, horrible timbre in the highs, cymbals sound distorted, lifeless mids, bloated bassFosi Audio IM4 User Reviews
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Cons
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