yup I always go for the real bad situation(but still trying to use actual values) as I believe that if my argument can stand with it, it can stand always in practical situations.
Anyway, to follow up on what you're saying, I agree about volume matching, but how would you take care of frequency mismatch? What would be the point of that since that's exactly what (seemingly) causes the differences to begin with? A good DBT will show differences if differences there are, and none if there are none.
well good point. a real objective DBT would probably not pass on this(that's where you know I'm only half assed objectivist^_^). I though it would be ok for some slight 0.2 or 0.3db roll off, else I would act like bigshot stated and get rid of it. I would EQ it, given that a very small EQ would have very little negative effects, it should at least be in the inaudible range. so a much better option than an audible roll off IMO. (I'm talking hypothetical situation here, I don't even have anything to match levels at home).
from that, if the results were to show people guessing, as it usually does for dacs with god specs, I wouldn't bother looking further. if on the other hand, the one upon which I used EQ is clearly disliked and identified, then it would be a real problem ^_^.
I guess I could apply the EQ to the other one to determine if we're judging the EQ or the dac.