Boom

http://www.globaldelight.com/boom/

YouTube Video




Boom is a system wide volume booster and equalizer application that lets you effortlessly improve the sound of your Mac.

Using Boom is easy. It works like the volume controls of your Mac to boost the sound; making it a louder, clearer andbetter sounding experience.
Boom can boost them all! From videos on YouTube to your favorite music/video playing on iTunes, Spotify and Netflix. Even video chats through Skype and FaceTime can now be audible! 

Use equalizing presets such as Jazz, Acoustic, Classical and many more or just customize your very own preset to something unique.
Boom is now accessible with localized “Help File” support in five additional languages: German, French, Italian, Spanish and Simplified Chinese.
To improve the audio quality of the Mac in-built speakers, Boom works its magic perfectly on the latest Macbook Pro and Macbook Air and the new iMac with a fantastic retina-display.

Boom- Blow away the silence!