For what it's worth--there was a recent article published in a peer-reviewed journal of acoustics that essentially measured standard CDs to higher resolution recordings (SACD, DVD-A). Theory being--that the higher sampling, thus yielding higher resolution, would sound better.
Well--it didn't. Hundreds of participants, over a vast array of audio systems (from budget to ultra-high-end) were not able to consistently differentiate the formats at reasonable listening levels. (They could, however, at unlistenably loud levels. Which, if one did that for long enough--one would eventually ruin their ability to differentiate such a difference!)
In short--I used to buy into the idea that upsampling would yield better sound. The data clearly does not support this hypothesis.
In short--it seems that the analog circuitry after the DAC may be just as (if not more) important than the DAC itself. And since standard 16 bit seems to be every bit as good as higher resolution formats--it seems that Frank's DAC would be a no-brainer.
It took me a while to come to this realization--but it seems that bowing down to the almighty sampling rate isn't what it's cracked up to be.
