Boom is an app designed to let you adjust the output stream of a Mac, adjusting the equalization and volume. Available from the App Store for $6.99, Boom installs easily.
Boom consists of a graphic equalizer, which allows you to adjust specific frequencies of an audio stream, as well as a volume control, both to better control the output from your Mac's audio outputs. Boom can work with any players (video and audio) including iTunes, or you can drag-and-drop audio or video files on the Boom interface. While most users will use Boom to adjust the volume of the output, allowing audio to be normalized to remove volume differences in several files, Boom also allows you to compensate for missing bass, too much high-frequency boost, and other equalizations that make your audio sound better to you. A graphical display lets you see the changes you are making. The Boom interface is easy to use and attractive.
We used Boom on standard audio and video files from iTunes and Netflix, as well as in apps like Skype and other IM products, and it let us do a number of useful tasks. We could boost the volume and frequencies over Skype so the audio stream was clearer, for example, and we could easily tone down booming bass bloat on some audio files. Boom never got in the way of our listening or using, and at least at the time of this writing, we know of no other app that works like Boom.
Editors' note: This is a review of the trial version of Boom for Mac 1.6.