Setting Dell USB Sound bar to default sound device

Open the Pulse Audio volume control from the K-Menu




K Menu showing path to Pulse Audio volume control. K-menu, then Multimedia, then Pulseaudio Volume Center




In the window, go to the Output Devices tab, find the section for "Dell AC511 USB SoundBar," and click on the button with the green circle. This sets the Soundbar as the default deviceImage showing Pulse Audio volume control window. Output Devices tab selected, Dell AC511 USB SoundBar Analog Stereo device circled, then the Set as Fallback button is circled. This button should be seleced to set the soundba as default






After this, close and re-open any programs that generate audio, like web browsers, for the setting to take effect