I installed and than uninstalled a volume booster(Boom 3D) for my mac, but even though it's officially uninstalled, it's still in my audio-output options. What to do? : r/MacOS
macos - Increase master volume beyond maximum in OS X - Super User
macos - Do you know a simple sound booster app for Mac? - Ask Different
Download free Sound Booster for macOS
Get unbelievably realistic sound & control your Mac's audio w/ 30% off Boom 3D - 9to5Mac