Distortion on Harman Kardon DPR 1005



Distortion on Denon 3805



Distortion on Harman Kardon 630



There are probably other factors involved that could make a digitally amped receiver superior to an analog one, yet the biggest one touted is lower distortion since everything is kept digital. However, the digital amps seem to have much more distortion.

Also, check these measurements that compare some flying mole amp to a bryston 4st.

From this I'd gather that digital amps are far less pure to the signal than solid state amps now. Perhaps because they are a very new technology. Yet not something I'd want to use just yet.