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This $100 IEM Could've Been The BEST. Fosi Audio IM4 Review
FOSI Audio IM4
FosiAudio IM4 - The open-back IEM that truly surprised me
![[2 days left] Fosiaudio IM4 - The manufacturer's first earphones, but they have a unique cool col...](https://i.ytimg.com/vi/_Xgmljy9Hfc/mqdefault.jpg)
[2 days left] Fosiaudio IM4 - The manufacturer's first earphones, but they have a unique cool col...
Fosi IM4 IEM Review - $99 Open-Back Choose-Your-Own-Adventure IEM
Fosi IM4 Review - Amigo Reviews Ep.73
But Can They Make IEMs Fosi Audio IM4 and DS3 Review
A new $100 FAVORITE OPEN BACK | Fosi Audio IM4 OPEN BACK IEM Headset Review
Fosi Audio's FIRST IEM is Amazing! IM4 Review
开放带来的弥散，镀铍振膜的音色，Fosi Audio IM4 动圈耳塞快评 | TDShorts 中文台
Fosi Audio IM4 Review — Professional, AIRY & balanced IEM
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Last Updated: August 23, 2026
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