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The gateway audiophile headphone amplifier.
No background hiss, neutral sounding, and powerful enough for most headphone driving purposes.
Minus a star for using a different sized case from every other O2 manufacturer, this unit is smaller in width, and longer in length. Matching dacs and other accessories from other companies (mainly jds labs) don't sit flush with this unit. And massdrop rarely seem to ever drop their matching dacs.