Infotainment Intercom Problem
 

My intercom volume is extremely low on our new 2015 Ultra Ltd and all the volume settings seem to be correct. I'm using the new headset (Infotainment) and my wife uses the headset from our old 2008 Ultra (Harmon Kardon). Does anyone know if the HK headset is compatible with the Infotainment system?.... is it causing the problem OR do I have a faulty system?