Use the Update Firmware to check

This will take approx. 2 minutes

This is example of 2 speakers set for Left and Right in Zone 1

Impedance has been set to 8 Ohm

Zone has been renamed from Zone 1 to Office

Right click on Zone and Impedance to get sub menu displayed

Add Pre-out 1 to Zone 1

Right click on the Pre-amp 1 Zone and change from Zone 5 to the Zone 1 (office)

Right click on the Pre-amp 1 Type and change from Left to Subwoofer

This is example of configured 2.1 zone with Left / Right Speakers and Subwoofer from Pre-Out 1