Okay, I have a little different take on all of this. My intuition tells me that you need to find out why your system sounds harsh and unnatural. I don't think that it's necessarily a question of digital vs. analog; there are many other factors to consider. Even some interconnects tend to sound harsher than others.
Perhaps it's a problem of room reflections and poor room acoustics. If so, placing absorptive or diffractive room treatments behind the speakers and on the side walls at the point of the first reflection could help considerably.
Aside from room problems, a typical way to get a smoother, more musical sound would be to try a good tube preamp in your system. I tend to like the sound of the 6SN7 tubes in my system. You could even try a tube line buffer like the one Audio Horizons sells. It may be that your problem is more of a solid-state vs. tubes issue. That Adcom preamp can sound thin and dry in some systems.
Anyway, that's my assessment. Good luck to you in your search for great sound.
Perhaps it's a problem of room reflections and poor room acoustics. If so, placing absorptive or diffractive room treatments behind the speakers and on the side walls at the point of the first reflection could help considerably.
Aside from room problems, a typical way to get a smoother, more musical sound would be to try a good tube preamp in your system. I tend to like the sound of the 6SN7 tubes in my system. You could even try a tube line buffer like the one Audio Horizons sells. It may be that your problem is more of a solid-state vs. tubes issue. That Adcom preamp can sound thin and dry in some systems.
Anyway, that's my assessment. Good luck to you in your search for great sound.