It depends on what you mean by smooth.
There are a lot of DAC's out there that reduce the dynamics to sound smooth because there is so much sibilance otherwise. I prefer a DAC that delivers ALL of the music and dynamics without ANY sibilance. Frankly, the only place you will find this in an off-the-shelf product is the Meitner, unless you are willing to pay for mods to other DAC's. This is how I got there.
There are a lot of DAC's out there that reduce the dynamics to sound smooth because there is so much sibilance otherwise. I prefer a DAC that delivers ALL of the music and dynamics without ANY sibilance. Frankly, the only place you will find this in an off-the-shelf product is the Meitner, unless you are willing to pay for mods to other DAC's. This is how I got there.