The Fiio K9 Pro ESS is a fantastic all-in-one DAC/amp that delivers a transparent sound, allowing your headphones and IEMs to shine. It comes with extensive connectivity options that include Bluetooth 5.0 and wireless AptX codecs. The caliber of hardware combined with the design and audio quality make the K9 Pro among the best desktop DACs you can buy for under $1,000. Why you can trust Android Central Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test . Fiio is a brand that…