Been looking for a system wide EQ for the Mac (Pandora, Netflix, Hulu, Youtube) for a while and been pleased with this app call Boom.
http://www.globaldelight.com/boom
http://www.macworld.com/article/1157061/expo2011bos.html
http://www.globaldelight.com/boom
http://www.macworld.com/article/1157061/expo2011bos.html