Fii Headphone Amplifier
O K5PRO ESS will allow you to truly appreciate the pure detailed and rich sound when connecting professional headphones. It uses ES9038Q2M DAC converter with powerful acoustic performance. One of the design features is an integrated potentiometer. From the interfaces on the Fii case
O K5PRO ESS USB port, S/PDIF optical connectors are located RCA inputs. The rotary control allows you to smoothly adjust the volume level in the headphones.