The most crucial usage of PRO3Z is to add USB operation to more mature DACs with out this input or improving the general performance of those with lousy UBS implementation. DXIO PRO3Z performs equally in terms of noise flooring but contains a spike at 24 kHz (half the sampling fee https://vymaps.com/US/Displays-Holders-VN47468/?id_new=1662a5af81416c2689d94e902b8d12d6