Your Blu-ray player should have either a coax output (looks like single RCA cable) or optical output. Either of these should connect to your TDAC, which then connects to your Hegel. If your CD player is hooked to the TDAC and you need that input you can most likely hook the CD player analog out directory to the Hegel.
Now that I look at it, the Hegel 160 has both coax and optical inputs so you should be able to connect the Blu-ray player directly to it.
Now that I look at it, the Hegel 160 has both coax and optical inputs so you should be able to connect the Blu-ray player directly to it.