Pulse Audio

The Following Works:

pulseaudio - Set default sound device output - Ask Ubuntu

How to run a command at login? - Ask Ubuntu

The following command will work without rebooting, make sure you use pactl list to get the correct device, grep it if needed

echo "set-default-sink alsa_output.Headset" | pacmd 

The following did not work:

sound - How do you set a default audio output device in Ubuntu 18.04? - Ask Ubuntu

Playback of sound is delayed from clicking play - Support / Sound - Manjaro Linux Forum

systemctl --user restart pulseaudio