4) Medium - Run the OSX audio optimization script - This will shut down alot of the startup process and useless things running in the background. Running less process = better sound quality. But only use it if you use your computer for playing music only because it takes a way alot of the main process needed to run other programs smoothly. But you can always reset the script easily when you are done with listening to music.
5) Hard - install OSX and Amarra/Audirvana onto a SD card, and then boot from SD card and then dismount your internal hard-drive. And do all of the above also.