I am here new and rare being not American. I have today installed Marantz 1604 (silver/gold). The installation went smooth, but the initial results are not overhelming. I expect manual loudspeaker's adjustment will bring better results. The question is then: how the Audyssey works, how the software adjusts the speakers, what is the alghoritm, etc?. At first sight it seems to be useless function, perhaps dedicated to show new and advanced feature.
I will inform about results of my manual fittings soon.