NAD -  DG AO900 arrived safely in the post and seems to be working just fine. It's a used one I picked up in the FS for a good price but alas comes without the footswitch! Had a few BC'ers been asking how the new models stack up against the (now discontinued) v1s. I'd say it's a significant evolution rather than a revolution. In particular: The power module delivering 900 very clean watts at 4 ohms and 2 ohms is still the same. The Series 2 models both sport the same clean li