Fiio KA1 USB DAC Review FiiO’s second member of the USB audio adapter series, the KA1 is our guest for a review. The KA1 inherits the design style of the KA3 and has a compact body, just 40x15x8mm, even smaller than many USB flash disks. Employed in the KA1 is the ES9281AC PRO chip from ESS, which combines a USB audio interface, DAC, and amplifier into one package. When combined with the multi-layered HDI gold-plated PCB it is on, a … Continue reading Fiio KA1 USB DAC Review