Is there free utility to amplify the system volume? Possible Duplicate:
  Do you know a simple sound booster app for Mac?
  Skype way too quiet. How to get louder Skype audio output on my MacBook Pro?  




I came across this question about tools that amplify sound in OS X, but they're not free.

Are you aware of a free tool that boosts the volume?
If you're happy to get your hands dirty and you're a registered Apple Developer, you could use Soundflower to pipe your system audio into AU Lab (search for AU Lab on the ADC Downloads page) and push everything through Apple's own awful AUDynamicsProcessor Audio Unit.