Missing HAL folder in ~/Library/Audio/

I wanted to delete some audio input/output because I never use them or I've deleted the app. Thus I searched on youtube how to delete those since you can't delete them in MIDI nor System Preferences. It appears that all those were located in a HAL folder in Audio Plug-ins. Unfortunatly I can't find that file. Can anyone explain how I can find the HAL folder or even better, how to simply delete those audio drivers?