Problems with external speakers

Though this app does make my MacBook Pro 15” Retina internal speakers sound good, when I try listening with either bluetooth (e.g. headphones), usb (e.g. external display), or airplay (home tuner) speakers the sound is so distorted (clipped) that I can’t listen to it. It doesn’t matter what I do with the settings inside Boom 2 they sound really crappy. It does seem like the earphone jack works ok. I tried to contact support through the app and the email bounced back saying that the “mailbox is full”. Not a good sign. I’ve uninstalled it for now and hoping for an update soon. I’m using Boom 2 verion 1.3 and OS X 10.11.1 (El Capitan)

katoray about Boom2:Volume Boost & Equalizer