I have a Fiio and an ak sr25 I'm playing with. My hu is currently out of commission so I'm trying to send a direct digital source to the amp from one of these players. I select line out on the sr 25 and spdif out on the fiio and I have a coaxial to optical converter connected. If I do a line out from my pc though this cable connection I get sound, if I try thru these players I get nothing...so it's not the cables as far as i can tell...anyone use a dap know what I'm doing wrong? I'm really stumped.