Actually that's not true. I used my Amplifi last night at a show, and ran a line from the headphone out to the PA. During our break, I was playing songs from my iPhone, to the Amplifi via Bluetooth, and the songs were playing thru the PA. Handy feature!
I just wish there was an option to have the speaker on or off when using this output, instead of it bypassing the speaker entirely. Would be nice for playing on stage for some stage volume and a line out send to the PA.