Fosi Audio IM4 - Reviews & Ratings
1 Review (B Tier | 6.3/10)
Summary
Reviewers consider the Fosi Audio IM4 to be a dependable partner that gets the big things right and tidies up the small ones. It includes thoughtful accessories and a fit that disappears once seated. You end up listening longer than planned.
Fosi Audio IM4 Details
Driver Configuration: 1DD (10mm beryllium-coated)
Tuning Type: Neutral
Price (Msrp): $99
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Review
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
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| IEM | alt. Score |
|---|---|
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Fosi Audio IM4 vs. Kiwi Ears ETUDE
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IEM Finder Quiz
newAverage 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.