The Head Box S2 Digital takes the advanced digital design of the DAC Box S2+ but adds headphone support to the outputs for added convenience. With support for PCM files up-to 32-bit / 768kHz and quad-DSD decoding (DSD256) via the rear-mounted USB port theres very little this compact device cant handle with ease. The clever internal design means unwanted noise entering the system via USB is double-filtered to suppress it to insiginficantly low levels. Fully Hi-Res Audio certified and Roon Tested the Head Box S2 Digital is a DAC thats more than comfortable in far more expensive audio systems.