The new L and R speakers are BRAND NEW. Purchased from Amazon. The old speakers were Sony. When I plug in the Bose to the negative and positive terminals on the cable (all prewired) there is no sound. The rest of the 5.1 system works fine. In fact, when I plug in the old Sony speakers they are also producing sound. When I plug the Bose in there is no sound...? Any fix? Reason?