I have recently purchased a pair of Sony Wh-1000XM4 headphones & bluetoothed them to a NadC700 they sound great, but I can't for the life of me figure out how to un-connect them when I want to listen through speakers, I have tried un-connecting them in the players section of the Bluos app, and although it says the headphones are now unconnected its not activating sound back to my wired speakers? After hours of frustration the only way i found to re-enable speakers was to pull out the mains cable from the Nad and reboot.