Haven't used my Bose stereo system in my cabin in years. Remember salesman showing how to get speakers on in cabin. Stereo powers on, but don't know if I need remote or look for a knob on wall.
The speaker selection button is on the Bose Remote, you can toggle between 5 speakers, 3 etc. for surround. You also should have a Zone 2 remote for the forward stateroom control as it is separte from the main cabin/galley system. Your subwoofer is located under the salon sofa.