The way in which you adjust the volume of your computer depends on the type of computer you are using, and on your operating system.
Nothing should be muted and the balance control must be centered for best performance.
In the Hardware and Sound menu, click on "Manage audio devices"
In the Playback tab, select "Bose SoundLink Audio"
Once "Bose SoundLink Audio" is selected, click on "Set Default"
Click on the Audio tab
In the Sound Playback section, make sure that "Bose SoundLink Audio" is the default, if not choose it from the dropdown menu