I want to buy a Fiio e11 amp for my rMBP/iPod. However, I have been told that simply hooking up the e11 to my rMBP would result in double amplification, which is apparently very bad. If there a way to use my rMBP's DAC but send that signal straight to a Fiio e11? I want to do this because rMBPs and iPods supposedly have good enough DACs for what i'm after, but not good enough amps.