Fiio K9 DAC review: No reason to buy the K9 Pro anymoreThe Fiio K9 is a mid-range DAC that has the same design and a lot of the same features as its costlier sibling, the K9 Pro. So do you still need to shell out the big bucks to get the K9 Pro, or is the K9 the better deal? Let's take a look.
Source: Fiio K9 DAC review: No reason to buy the K9 Pro anymore (https://www.androidcentral.com/accessories/audio/fiio-k9-review)