Jan 17, 2019

HE4XX HIFIMAN with a smartphone

With less than 100 $ what are the best dac / amp for the Hifiman HE4XX using a smartphone as an audio source?

Your title is HE4XX with a smartphone. Will you be using your smartphone as a source or a computer?
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There are many opinions on the web, but that are not made by audio experts, so I look for these more technical answers here!
I always use my smartphone to listen to audio for portability reasons, but at home I prefer my speakers. I tested the Hifiman on my home amplifier and the quality difference is huge, so I am looking for a portable amp / dac that solves the problem of poor sound quality of the smartphone.