Below is what Nick told me ...
"The output of the amp does not have DC blocking caps in the signal path. Instead, there is an active circuit which compensates for any offset seen at the output, driving it to near zero."
I like the idea he is not using any dc blocking caps.
EDIT: I also measured zero dc offset from AMP's output even with the 1.5v from ipod's lod.
Well then I am mistaken :) Fascinating stuff indeed.