In the past I didn't care so much about trends since I wanted just the very best sound I could get, and now I realize how much that cost me over time. So I watch and I see more and more integration of DACs and headphone amps. Now I can understand someone making a very expensive amp like the new Sennheiser (well, actually I can't, but....) and since it's a purist item more or less, they expect you to buy a good DAC separately. But even that isn't clear anymore. I'm not certain whether manufacturers think that DACs are just a commodity any more, or whether they detract from concentration on their own amp designs, or what the logic is. But I am convinced that nobody should be making a new audiophile headphone amp today without a DAC, unless they have tested it with a variety of suitable DACs, and listed them along with any notes, any pluses or minuses they observe in using DAC 'x' or 'y' with their new headphone amp. Any less than that and IMO it's not audiophile.