You may be right, but I was unimpressed by the following spec which I had read in the preview that Lovin linked:
I noticed that his speakers do get down to 4.5 Ohms:
and the Sound & Vision review of the DA
4600ES indicated:
which makes me think it may not have a very good power supply.
In contrast, for the Denon 4200, we have:
So, with two channels driven, the power only increases by ~28% going from 8 to 4 ohms on the Sony, while the Denon increases by ~75% for the same situation. Since he is driving 6 channels with the same speaker (so impedance/phase for all speakers drops at the same frequencies), it occurs that power might be an issue. Hopefully the 5600 is quite a bit better.
But certainly you are better qualfied to interpret that info than I!
Edit: the Sony does do much better at 1.0% distortion. I don't know what that means relative to running 6 channel and higher current.