I have a non Bluetooth turntable that I want to output to a Sonos roam so I can send to the rest of my sonos system. Currently the turntable is plugged in to powered speakers via rca which I would like to retain. Does anyone know of a Bluetooth transmitter with that allows rca to pass through it so I can add the Bluetooth while retaining the cabled connection to the speakers? Have googled but not finding anything.