I think that the Bose systems that have music centers have powered subs that contain not only the amp but also the proccessing of the system. It appears that your system might be made up of two incompatable parts. I do know that the bose lifestyle 12 that I owned was this way. And yes like those who posted before me I must say that the 970/7125 combo with Polk speakers that I have now is light years ahead of the Bose in sound quality all though it is not as simple or compact.