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"This answer is from a 2006 thread. Audio Hijack is no longer available, but there is a Pro version for $32:
The most popular solution for this is using Audio Hijack. Great app to
have for a variety of things (e.g., recording streaming audio), but
it's also perfect for what you need. It allows ""hijacking"" the audio
output of an application and applying Audio Unit plugins or its own
built-in EQ to the output.
So, step by step:
Launch Audio Hijack
Create a preset for whatever application you'll commonly want to make louder (i.e., itunes, vlc, mplayer, quicktime).
Open the EQ on that preset
Activate the EQ and move the gain/level up to desired volume
""Hijack"" the application (but you don't need to hit record) posted by Señor Pantalones at 9:54 PM on July 15, 2006 [1 favorite]
Let me offer you a guess as to why this may be happening. If you read
the Apple Discussion board thread Alan provides, you'll see that some
people report this problem after a software update.
I think Apple is choosing to limit the output volume of its laptop
speakers as part of an overall strategy to deal with their infamous
overheating problems. Speakers are a big power consumer, and if you
limit their volume with software, not only do you reduce the heat the
speakers generate directly, you reduce the heat generated in the sound
card and in the battery by the battery's own internal resistance --
and the batteries have, according to some reports, been getting hot
enough to swell up in some cases.
If this is true, you probably can fix it with a hack like the one
Senor Pantalones offers, but you then might want to pay close
attention to how hot your computer is getting."
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