Thanks Pardales, I've spent quite a bit of time with it now and think I like it better off. I hear a slight increase in resolution with it on but things are ever so slightly smoother with it off. Perhaps something is being masked, or there is a flaw somewhere else in my system, but particularly on vocals it sounds more natural to me with it off. String instruments a bit better with it on.
Sometimes this stuff drives me nuts, but I do like the DAC
Sometimes this stuff drives me nuts, but I do like the DAC