The Hidizs S9 produces great DAC and headphone amplification worthy of the clickbait title of this review! 
Text review: https://www.audiosciencereview.com/forum/index.php?threads/hidizs-s9-review-headphone-adapter.21152/

Text review: https://www.audiosciencereview.com/forum/index.php?threads/hidizs-s9-review-headphone-adapter.21152/