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I'm about to pick up a Schiit Bifrost, but I'm going to get the upgrade boards separately. I want to be used to the sound so that I can notice the difference in sound when the upgrades are put in. My question is, which of the upgrades brings the biggest boost in performance? I'm trying to decide whether to get the Uber analog board or the usb board. I'll be running flac files from a pc to the Bifrost, then to a Bottlehead Crack driving Sennheiser HD650's.