Sorry if it's confusing. My reference is using my own ears to listen for a difference. Trying uncompressed after flac, there is less of a noisy edge to everything. It's more relaxing. A friend came in and I asked her to try to see if she could tell if there was less noise in my sound compared to before, and she said yes, it's very relaxing like that. I would have kept my opinion anyways, but nonetheless, someone else agreed. Now I fall asleep easily if music is playing. I would not have seemed like it made as much of a difference on my old dac, but with the new one, it's more obvious.