As Rob just mentioned, at the Head-Fi office, we happen to have the same audio analyzer that Rob is using, which is Audio Precision's flagship
APx555. We've had it for a while, and I'll finally be saying more about it soon. I think it's fair to say that it's the quietest, most precise audio analyzer currently made, and should be able to get the full measure of any current audiophile DAC, amp, preamp, etc., and is also pretty fantastic for acoustic measurements (which we pair the APx555 with a G.R.A.S. 45CA for). To help with our acoustic measurements, we're also working with a company to have a custom lab-grade sound and vibration isolation chamber built (which should be completed in the coming couple/few weeks)--the chamber will also be EMI-shielded, which may or may not come in handy on occasion.
We've been doing audio measurements for a while (acoustic for about a year, and electronic for a little less than half that), and, again, will be saying more about it all very soon.