I have tried numerous configurations on my system to get Digital 5.1 surround sound on my B&O System from the Mac mini I have a MAudio Transit via USB to Optical out to the TV. The output is AC-3 which B&O state is the correct input for the Digital audio in. If i select digital input on the Bang and Olusfsen i get no sound. I do get great sound through the normal Audio L - R inputs on the TV just can not get the Digital Input to work anyone have any experiences which may help. Thanks.