If it's of any use to you, I don't think this was mentioned but the 990 has balanced outputs as well as unbalanced rca's. For me that's a big perk because I can use pro amplifiers plus avoid ground loop/hum issues. While I've not heard the Rotel or the Adcom, the 990 seems neutral here. Also the 990 has more optical inputs and DVI Switching, something else the Rotel lacked.