Uploaded September 2025 | Updated September 2026, 2 hours ago

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The IM4 marks our very first step into the world of IEMs. With it, we set out to create a product that embodies Fosi Audio’s design language inside and out in both aesthetics and sound. The name “IM4” resonates with the phrase “I am for” — a declaration of support, advocacy, and identity. It is open-ended, inviting participation and interpretation. For us, it reflects Fosi’s spirit of openness, listening closely to every user’s voice.
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Back us on Kickstarter: kickstarter.com/projects/fosiaudio/fosi-audio-im4-open-back-in-ear-monitor?ref=7a4owh
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