I might have a workaround, you can try using an app called Boom 2, its used as a equalizer/volume booster
Once you open the app, just use the Option key and then click the speaker to change the Output Device to "Boom2Device", if this fixes the issue you might have to try and reload the kext extension for Audio.
Once you open the app, just use the Option key and then click the speaker to change the Output Device to "Boom2Device", if this fixes the issue you might have to try and reload the kext extension for Audio.