You can get a dongle to plug wired headphones into - not an ideal solution but it works.
EDIT: Several threads on this online - your options are to either use a BT dongle or a DAC/convertor via either the optical or ARC options.
Well, it didn't work.
Sound does come through the DT 990's, but, it's almost like the AMP part of the Sound Card isn't working, because it's quiet, and neither the volume control on the Creative Sound Blaster or the TV increases/decreases the volume.
Any thoughts?