They are both priced about the same trying to power my hd 580 using a iPhone as a source via Los. I would run the toucan balanced via reternimated stock cables . Thanks

I am looking at purchasing a Ibasso pb1 toucan to power my senn hd 580 from an iPhone 4. I plan on using a lod to 3.5 mm jack on the iPhone connecting it to the amp and then connecting the hd 580 headphones via a balanced to unbalanced adapter. Does this sound correct? Anything I am missing ...