When I play my SMSL D0100 Pro DAC into my Schiit Saga S pre-amp into my four Kenwood L-05M amps powering Vandersteen 2ce Sig II speakers, the sound is unforgivingly fatiguing to my ears, to the point of aggravating my tinnitus (but extremely detailed.) I expect the amps are just providing gain so they are not imparting any warmth to the signal. So my solution was to add a Hagerman Audio Tube Buffer in between the DAC and the pre-amp. Now the sound is wonderful, and the detail level is still very high.