I agree with @electroslacker, except about buying the best cables. Especially a digital cable. As long as the cable passes bits it doesn’t matter. Goodness, my $8 HDMI video cable passes a whole lot more information flawlessly than my USB audio cable does.
In the past, some unscrupulous manufacturers have manipulated the standardized analog conversion formulas for their DACs. Basically adding internal EQ to them to make them stand out. That’s not what a DAC is supposed to do. I used to be a programmer and have written other types of conversion formulas. There’s no big mystery to them. Once they’re figured out, they’re figured out ... and standardized. Theoretically, all DACs should output the same, with noise, including jitter, being below audible thresholds. And I think ASR’s measurements continually prove that. I worry about the speakers and the room, not the digital components.