Coax digital does not have copy protection, so the player is going to down convert to 48. Hdmi is the only way to pass a signal higher than 48hz to an outboard dac. I had this same issue a few years ago with two different DVD players feeding a 96hz dac. When I would push the audio button, the player displayed a 96/24 signal, but the dac displayed 48k. The odd thing was that I got two discs to play. The DVD video portion of Neil young,s live at Massey hall, and the DVD audio disc version of the Beatles love disc. All others would only play at 48hz. When I changed to a new hdmi receiver, all of the discs played their native hi Rez format. The older DVD players were pioneer universal players. My new player is a denon universal player to a new pioneer elite receiver. Good Luck.