How to output sound to the USB port?

I know I need a USB Audio Driver but I'm unable to find a driver that is FREE and works. I have a Yamaha RX-V473 tuner and it has a USB in port. I see comments on line that the USB port has much higher quality sound than the headphone jack and I want my iTunes to work with the receiver. AirPlay never works from my laptop, so I'm trying to go this way.

Yamaha does not provide a USB driver for the Laptop. There's no provided driver to download on the product page. Already looked.

I can output from my iPhone, but I want to use my laptop rather than tieing up my phone.

Please no alternate suggestions.

In this output sound to the SUB port the writer pointing out at the lack of the used to communication items. The SUB port is good usually use to port. I know SUB Audio Driver but used to find a driver that is working for this.

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