ShakyJake
100+ Head-Fier
Dragonfly black $79 (Stereo Advantage via Amazon Prime)
https://www.amazon.com/AudioQuest-DragonFly-Black-Preamp-Headphone/dp/B01DP5JHHI
https://www.amazon.com/AudioQuest-DragonFly-Black-Preamp-Headphone/dp/B01DP5JHHI