HELP !!, I am totally ignorant on this topic, however, I am highly motivated to be able to go to the next phase to enjoy music and neeed your help to understand the basics , I’ve just ordered the 6xx (looks like the next batch is going to be available in April/21 ???) , I am mostly using Mac laptops and iPhones, I understand that I need a DAC and an amplifier , I think I understand the role of the amplifier, but, what does the DAC unit does?.....I saw a few youtube recommendations to pair the 6XX with Schiit Modius and Magnius...can someone here that knows this stuff advice me what would be a good entry combo of a DAC and amplifier for the 6XX ?.....or , point me where I could read and learn ??? Thanks ..