As you know I also have the NAD T-773 so I will be doing a true side by side comparison just for giggles.

As for what speakers the Yamaha will be running, here you go:

Onix Rockets RS 550's MKII's (6 ohms)
Onix Rocket RSC200 Center Channel (4 ohm)
Onix Rockets RS 150's (6 ohms)

So given that, the Yamaha will be driving a relatively hard load. It should be a good test.