I recently purchased the sound bar from Bose. This is the boss 500 model. I also attached a bass module, rear speakers to complete the set. And while the sound a spectacular, I am unable to find the option to force stereo on all speakers when listening to music.So I do get 5.1 sound when I’m watching Netflix or streaming on Amazon but I play Amazon Music or Apple play I only get sound from the front speakers. Is there a way to enable the speakers at the back? Or a forced stereo mode?