I was bidding on a 9090 on goodwills site and was quickly out of the bidding as the numbers quickly went crazy. I know it's a fairly high wattage piece and most I've read about it describes "some very sophisticated electronics". Can someone elaborate on this? School me a little as to the features and guts of this piece that make it so desirable. Thanks. I have a few sansui receivers and love the sound. I sold all but one of my marantz receivers after getting into sansui.