Woodworker83

Not sure if you were ever able to figure this out. If so, great, I'll just post this for anyone else that may need it. Worked for me. Got from Sony's website.

NOTE: Some A/V receivers have a Speaker A and Speaker B switch on the front panel of the unit. The Speaker A output is used for the speakers in the main room while the Speaker B output is for a second pair of speakers in another room (garage or patio, etc.).

Follow the steps below to access the Speaker B option on your receiver:

NOTE: For model-specific information regarding any of the steps below, refer to the supplied manual. Manuals are posted on your model support page.

Make sure that speakers are properly hooked up to the Front B speaker port of the receiver.
Using the supplied remote, pull up the menu of the A/V receiver and select Speaker Settings.
Under Speaker Settings, select Speaker Pattern.
Use the arrow up button or arrow down button to choose 3/2.1
Select SB Assign parameter.
Select Speaker B.
Press the SPEAKER button repeatedly on the receiver until SP B is displayed on the front panel.