Fosi Audio IM4. Explained simply.

Important rules for best sound 1. DO NOT use the Balanced tips. Use either bass or deep bass eartips. 2. Use the black nozzle. 3. Pick up the gold nozzle. Hold arm at 90 degree angle. Throw at full force at nearest wastebasket. 00:00 Introduction 00:09 Notes on the screen 00:30 Accessories 1:29 What's my guess of the tuning? 3:57 Bass 5:24 Female vocals 6:12 Male vocals 7:49 Soundstage, comfort and sibilance 8:38 Defiant Factor 9:18 My Voice Through This IEM (Male Vocals)