Just a quick note. Upgraded my streamer to Windows 10 feature pack 1903 and after that something happened with my audio devices. That caused loss of all audio device settings from OBS. Only silence before resetting them from audio settings.
First veriy the you have audio with other programs. Make sure your audio source is not disabled in OBS, if not, try deleting the audio device from your windows device configuration and reboot the system so it reloads automatically, We oftem see at work windows updates that conflict with the current system BIOS and audio or wireless firmware. Make sure they are updated if you have a PC. also try deleting your audio source and adding it back into OBS.
This was already solved on the first post. Just had to go thru the device settings and set them correct again.