Ar_t my question exactly. From the tone of your question I'm guessing you have something else on your mind :-).
If you get Stereophile, check out Aug 2005 page 114 for Channel Islands D-100 specs:
"But you can see from this graph how the ultrasonic output rolls off presumably due to the low-pass filter necessary to minimize the H-F noise produced by the switching output stage.
Even so, a relatively high level of this noise is still present in the D-100's output as can be seen in fig 2."
