I bought all this gear (DAC, Amp, Headphones) so that I could listen to music in the corner of my room.  Then I learned that the iPhone 5 can't do digital out.  So I can't hook up my iPhone 5 to the DAC I bought (which accepts a USB in).  I don't want to have to drag my laptop over and hook it...

I have never heard music come through a DAC.  I have just purchased the HD 650's and the Bottlehead Crack kit.  That's already a bunch of money.  Can I get by with something inexpensive like the Fiio E10?  Or would I notice a huge difference with something more expensive?  If so, what would you...

Is the Bottlehead Crack the best amp for the HD 650's?  I'm looking for something under $300 that is fairly small in size, but doesn't have to be portable.  Also, I know the JDS Labs C5 amp is something different entirely, but how would it compare?   Also, I'm new to all this.  Do I also...

I just bought the SE215's and play some music off my iPhone and notice that the highs are extremely loud, to the point where it almost hurts my ears to listen to it.  I've had Shure E3c-n's in the past and loved them.  I had Klipsch S4's too that I liked.  I also have some Beyerdynamic T50p's...