Can DAC1 HDR handle multi channel bit streams?

Hi,

I use avr350 for both 2 channel music and movie. I don't have multi channel speakers setup. I am looking to change my sound system to dedicated 2 channel setup. I plan to get Benchmark DAC1 HDR and connect SB and computer to DAC1 via coax/TOSLINK. DAC1 will be connected directly to a power amp. How would DAC1 handle if my computer (Mac) feeds multi channel audio bit streams to it? Do I need to configure my Mac (or video player in Mac) to output only 2 channel signal to DAC1?

Thank you.