I agree with Charles' comment as well. I would add that the knowledge and experience that goes into the design of the printed circuit board itself can make a big difference in the performance of a DAC. How signals, power, and grounds are routed and distributed within the circuit board, and also how power is "decoupled" (i.e., filtered) immediately adjacent to all of the critical chips, are all hugely important in a DAC design.
Best regards,
-- Al
Best regards,
-- Al