I ran across this fairly new app called "Boom" in the mac app store. I tried to see if there were any threads started but couldn't find any –– if there already are I apologize in advanced.
Now, It's not my place to give this app raving reviews when it comes to the technical aspects of computer audio / software since I'm a noob, but my first impressions of this app are pretty impressive. Just messing with the preset settings, the sound quality is amazing with my Sony XB500's. It features and EQ for custom settings as well, and works with a slew of musical apps. (i.e. iTunes, Spotify, etc.....)
Any audio veterans care to give insight?