ThePCEnthusiast posted a review on the Fiio K3 DAC AMP
A quote from the article:
In todays audio review, we are going to check out a pocket-friendly and budget-friendly portable USB-DAC with headphone amplifier from Fiio the K3. Affordable audio solution is Fiios forte, and most of their (newer) products offer a good balance between price and performance.Fiio K3 DAC AMP Review