DAC connection to computer

Connect directly to the DAC by USB from the PC. Use Foobar2000 as the media player and use Foobar2000 Controller Pro on a phone as a remote to select tracks and play.

USB is flawed. Why would you go from fiber to usb? You’re going backwards.

All dacs in preamps/integrateds are compromised compared to quality standalone dacs. 
It’s funny when people say don’t hook up a computer directly to your dac but every streamer is a computer.

There is only 1 streamer that has a galvanized input/output, and I use it with i2s into my dac.

@rbstehno stand alone DAC is my preference also since it isolates the conversion from both the computer's and the amp's electronics but OP is asking specifically about connecting his PC to the DAC in his integrated amp.

Ah.

"A streamer is a computer."

A single use box is totally different than a general use PC.

Galvanized, fiber optics, sales gimmicks.

+1 @travelinjack 

In addition to Foobar, you have the JRiver Mediacenter as another option for locally stored music. Connection from your computer to the Mac 7900 via USB A/B.

Using (for example) Quobuz as the source of music (PC app available), you can send the stream via USB to your DAC as well.

Give it a try. If you are satisfied with the soundquality, you will not need any additional hardware. If not, you may want to go with a dedicated streamer.

I am using an Android platform including USB Audio Player Pro going directly into the integrated amp via USB A/B (and as well via separate DAC to the amp).

It is all about personal preference.