Uploaded June 2025 | Updated September 2026, 9 hours ago

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Not sure which headphone amp pairs best with your Fosi Audio i5 planar magnetic headphones? In this video, we walk you through 6 Fosi Audio headphone amplifiers — K7, GR70, GR40, SK02, SK01, and our flagship Mamoritai Euphony — highlighting their key features and explaining why each one is a great match for the i5.

From portable convenience to warm tube tones and high-end performance, there’s an amp for every kind of listener. Whether you’re after ease of use, power, or premium sound, this video will help you choose the right amp for your needs.
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Timestamp
00:00 Intro
00:23 Specs of i5
01:20 K7 HiFi DAC & Headphone Amp
02:36 GR70 Vaccum Tube Preamp/Headphone Amp
03:33 GR40 Tube DAC Preamp
04:22 SK02 Desktop DAC/Headphone Amp
05:18 SK01 Headphone Amp/Preamp
06:01 Mamoritai Euphony Headphone Amp/Preamp
07:10 Comparison Chart
07:16 Ending
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