[Alyus]

And when I switch back to speakers, iTunes runs back to normal but with Schiit Fulla iTunes and Spotify would play and stop repeatedly. Also, I am getting a loud hissing and humming from the Schiit Fulla. I'm using HD 598.
 
Also Youtube will load and not play with the Schiit Fulla on. Everything goes back to normal when I play with speakers.

 

[Alyus]

The solution to the problem was to lower the Schiit Fulla volume since it was at its maximum.