You can connect a music device via line-in to your Beolit 17 and use it as a line-in speaker.
Short press on Bluetooth toggles between line-in and Bluetooth. Note that when you switch to Bluetooth the line-in source continues to play on the connected device, and must be stopped on the connected device.
You can adjust the volume of your Beolit 17 both on the line-in connected device and on the speaker.
