Hi there, I've got a question for all you 2-channel listeners. I was wondering if a pre/pro is necessary if I do not have any intention of using multiple sources (ie. I will only use 1 source). My theoretical setup would be MacbookPro ---> benchmark DAC1 via tos-link ---> dedicated amp via RCA or XLR if available. Secondly, are there any disadvantages to this approach of skipping the preamp? Thanks.