Uploaded October 2025 | Updated September 2026, 2 weeks ago

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Thanks to Fosi Audio for providing the IM4 for review.

Pledge on the Kickstarter (affiliate link): fosiaudio-inc.kckb.me/c47e7f99-n6a

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My FiiO FT1 Review: youtu.be/_WiTDktQcAE
My FiiO M21 review: youtu.be/22bHTUv3G8k
My iBasso DX180 review: youtu.be/WcwIwukvYmc

My Other IEM Revews...

Apos Rock Lobster: youtu.be/gTf8uILhNZM
BASN MTPro: youtu.be/NYZRZzrVkWw
DUNU Vulkan: youtu.be/TDZXhTBd0-E
Effect x Elysian Pilgrim:Noir: youtu.be/cdWMu-r_A_Q
FiiO FH19: youtu.be/K8BDyurdX5w
Final A5000: youtu.be/LQoD9ZKEbb8
Fir M5: youtu.be/TKz6CRPo1cw
HiFiMan Svanar: youtu.be/OoGlplrted4
Kinera Nan-Na 2.0: youtu.be/2ouSYSc7qBs
Kiwi Ears Quintet: youtu.be/zfJUxpBNL8Q
KZ DQS: youtu.be/RJJAgApRm_U
Mangird Tea v1: youtu.be/rARdiIfh_yk
Meze Alba: youtu.be/NCV51QAJaVQ
Moondrop Aria 2: youtu.be/wrC2eiGI_5g
Moondrop Blessing 3: youtu.be/0YdnMaQyic8
Moondrop Kato: youtu.be/q_6F8Xb_wwg
Moondrop Variations: youtu.be/e6tq0-b2k58
Rhapsodio Infinity Mk II Plus: youtu.be/QHhPn9KgWP0
Tanjchim Kara: youtu.be/FcjARMtNorU
TRN Rosefinch: youtu.be/BER_6toANvA
Truthear Pure: youtu.be/VZy8XA6S3M8

Timestamps...

00:00 Intro, Pricing, Disclaimer
01:35 Shameless Self Promotion
02:02 About the IM4
06:38 Test Gear
07:36 Sound
12:26 Comparison to FiiO FT1
15:50 Wrap Up
17:47 Sound Leak Test (there ain't much)
19:12 The End