Instructions said to plug Avantree usb cable into spare powered usb port back of TV. That muted ALL audio out on TV and sound bar so I plug usb cable into either 1) spare 5V power bank or 2) into iphone usb power plug - no problems. Bluetooth easy to pair with 2 headsets. I used audio 3.5mm cable from Avantree into headphones plug at rear of TV - Brilliant!!