I have a sonos playbar connected to my TV through an optical chord. The apartment I moved into has speakers built into the wall with the copper wiring. I just went to Best Buy and bought a receiver and the Sonos connect (Not connect:amp) based on the sales guys advice. I want to be able to play TV sound through the playbar and external speakers simultaneously. Is this even possible or was the Best Buy guy wrong. Do I need the connect:amp? Or is this impossible?