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I have a 2012 13" MacBook Pro. However the volume at its highest setting is still not loud enough in many scenarios.

I set the volume to highest in System Preferences. VLC gives me a way to increase the volume over 100% but I want to make the change across the system.

Can someone tell me how to make this change?

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If you notice with VLC, it's similar to "overdrive" in which it typically causes distortion of audio and a significant degradation of audio quality. One that could, over time, overwhelm and wear your speakers. It may not be wise to proceed down that route, instead it would be better to buy some spare speakers or headphones (+splitter if watching with others). – nerdwaller Nov 13 '12 at 15:05

There is no way to increase the maximum volume on a mac OS. Like you said, however, there are tweaks that can manipulate the sound to "distort" it and allow for louder sound. One such tweak exists called Boom that does this very thing. Not sure of any free tweaks.

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