Fosi Audio IM4 Review: In-Ears, die wie offene Kopfhörer klingen? 🎧

Fosi Audio's first IEM is here! In today's video, we're taking a close look at the Fosi Audio IM4. With its open-back design and 10mm beryllium-coated driver, it promises an airy sound signature usually only found in large over-ear headphones. We'll be testing: How does the soundstage perform? Can the bass deliver despite the open-back design? And how much "hi-fi" sound is really packed into this €100 package? We'll also be checking out the extensive accessories, including the interchangeable nozzles (brass and aluminum) for sound customization. Here are some affiliate links to products I currently use or recommend. For you as an Amazon customer, there are no additional costs, but I benefit from your order through a small commission: Fosi Audio (Shop): https://tinyurl.com/tbumn4m9 Fosi Audio IM4: https://tinyurl.com/4f8dtmdy Fosi Audio GR70 Tube AMP: https://tinyurl.com/yh4tustn Fosi Audio DS3: https://tinyurl.com/4w526tp8 Fosi Audio i5 Headphones: https://tinyurl.com/2trymbyc Fosi Audio ZH3 DAC / Amplifier: https://tinyurl.com/3t7jxkaw Amazon Headphones: FiiO FT7: https://amzn.to/3IibkX9 Hifiman HE1000 Stealth: https://amzn.to/4hzctq9 Hifiman Arya: https://amzn.to/4jYFT2h Denon AH-D 9200: https://amzn.to/4jWVTlu Sennheiser HD 660S2: https://amzn.to/4i9UeHt Sennheiser HD650: https://amzn.to/4jc5HIq Beyerdynamic DT 1990 PRO MKII: https://amzn.to/4osfagx Beyerdynamic DT 1770 PRO MKII: https://amzn.to/4hPAJFb Focal Clear MG: https://amzn.to/3YKroWp IEMs: Sennheiser IE200: https://amzn.to/43siRKH Amplifier: Topping A90D: https://amzn.to/4hzSveQ Topping A30 Pro: https://amzn.to/41rLgzR FIIO K13 R2R DAC and headphone amplifier: https://amzn.to/45kGxl2 FIIO K11 R2R DAC and headphone amplifier: https://amzn.to/3YUnzxW DAPs: Fiio M23 High-Res DAP: https://amzn.to/3CLm8e3 Fiio M11S High-Res DAP: https://amzn.to/41cvtoA DACs: Topping D90 III Full Balance DAC: https://amzn.to/3DbxFTW Musician Pegasus II R2R DAC: https://amzn.to/3LZ46sP CD players: FiiO DM13: https://amzn.to/4hVzJiV MOONDROP Discdream 2: https://amzn.to/47AGcwi Cables: Fii Audio 4.4 mm to XLR Cable: https://amzn.to/3CDJNNz Isotek EVO 3 Eternal Power Cable: https://amzn.to/41oBVca Oehlbach XXL Powercord: https://amzn.to/4334MEb 00:00 Introduction & Transparency 01:30 Technical Specifications & Comfort 05:43 Sound on the FiiO Audio DS3 Dongle 10:13 Sound on the FiiO Audio GR70 12:03 Sound on the FiiO M17 DAP 13:53 Sound on the FiiO Audio ZH3 15:09 Sound on the SMSL AO300 Pro 16:35 Conclusion