08-14-15: Paul79
The Totaldac Twelve is not cheap to make, no matter where he is located... 600 .01% foil resistors, at $20 a piece retail, it is easy to see where the bulk of the costs are. Add to that SOTA Parts, inputs, outputs, power supplies, cases, boards....
No question about it. And I would add that I wouldn't be surprised if in addition he has to go through a process of screening the resistors further, selecting some and rejecting others. While 0.01% is an exceptionally tight tolerance for a resistor, it does not even come close to supporting 24 bit performance in a ladder configuration. Presumably TotalDAC's use of 6 ladders per channel in the Twelve helps considerably, but consider that 24 bits corresponds to 2^24 = 16,777,216 possible states, which in turn means that the least significant of the 24 bits controls 1/(16,777,216 - 1) = 0.000006%(!) of the full scale (maximum) output of the DAC.
As I said in an earlier post in this thread, providing anything close to 24 bit performance via a ladder approach, as TotalDAC and MSB Technology apparently do, is an amazing (and invariably expensive) achievement.
Regards,
-- Al