Good question! I haven't gotten around to proper SNR testing, but I'm planning to do that. The board design has undergone quite a few revisions and improvements based on my own perceptual tests along the way. I've done my best to follow best practices and recommendations, but the size of the board (which was a priority) does limit how much can reasonably be done. If you're looking for audiophile-level performance, you'll probably want to consider other solutions :)