Hi everybody, I think I have a problem with my Apogee Duet (1st gen), but I'm a newbie when it comes to sound stuff and I want to be sure it's not a misconfiguration or my misunderstanding of something. Any thoughts/ideas would be appreciated. The problem is: I hear bass crackling when listening through Sennheiser HD555 headphones to more or less bassy songs such as E.S. Posthumus Nara or Positively Dark Howl (try it, it's legally free) with this EQ setting in my audio player called Vox.app: When I plug the headphones directly to my Mac and play the same songs with the same EQ setting, the crackling is gone even when I significantly increase the volume. If I turn off EQ while using the Duet, the crackling is gone as well. What do you think?