spdif coaxial using xonar d2 dacs?

[manhas]

Hi guys
i have a Xonar D2 and an 5.1 system Philips Hts 5540 and i connect the two through a coaxial cable
My question is in coaxial do i use the hts 5540 dacs or the Xonar dacs?
IF it is the Hts 5540 dacs is there a way i can use the Xonar dacs through coaxial?


P.s: The 5.1 system has only coaxial in and stereo in so i cant use three 3.5mm jacs to connect the soundcard



Thanks for the help!