Trigger out only on Zone 2

I want to trigger the Emotiva XPR5 ON when I turn on the Onkyo TX-NR717 receiver. Here's an excerpt from the NR717 manual:

"When Zone 2 is turned on, the output from the ZONE 2
12V TRIGGER OUT jack goes high (+12 V and max. 150
mA for Zone 2). Connecting this jack to a 12-volt trigger
input on a component in Zone 2 will make that component
turn on or off as the AV receiver turns on or off the Zone 2."

Question: Exactly how do I get the trigger feature working. Do I simply connect the trigger cable from OUT on the NR717 to the IN on the XPR5 and press the Zone 2 button?

Or: How do I make sure the XPR5 is a "component in Zone 2"?

BTW: Zone 2 is defined on the front panel as the Whole House Mode, there is no Zone 1.

Thanks - rev