Wanted to start a thread about iFi's Micro iDSD Black Label rigs vs. various Schitt stacks and other "All-in-one" units. I know many people have made these comparisons over the years, but my Black Label is "tricked out" and I'm starting to wonder: "How much better does desktop stacks get than my "portable" rig? How much money do I have to spend to get anything appreciably better?" I'm using the Sennheiser HD6XX open headphones. My rig improved considerably with iFi's iPURIFIER2. Then I added an iFi iGALVANIC3.0 and whoa! Then I added iFi's iDefender and iPower which made very little difference. I'm still using the standard blue USB cable that came with the unit. I upgraded the firmware of the Black Label which gives MQA capability which I use to stream TIDAL MASTERS w/MQA. My God! How much better does it get? Enlighten me Head-fi people.