Often I am listening to a recording on Mac that has been recorded to be soft. That means that even if I turn up the volume on the application and on Mac system settings the volume is still too soft. Is there any software that can allow me to exceed this limit? (ie. I don't believe that the limit is the computer's speakers, just the volume of the sound recording).
I'd suggest giving Boom 2 a try - it boosts the sound output system-wide as and when you require, and can be fine-tuned with presets and equaliser controls. There's a trial version available on their website, and it is reasonably priced.