Hello Audioholics,\n\nI am having almost 7 years old Yamaha Aventage RX - A1050 still doing great. I have an 5.1 setup with KEF Q300\/Q150 for front and surrounds, KEF Q600c for Center and SVS SB 2000 as sub. Other day I was just checking out new receivers thinking whether I can sell my current gear and checkout new one and came across a video by SoundUnited training videos who owns D+M. In one of the video I heard them comparing marantz and denon and vouching for marantz HDAM as something magical which makes sound warm and all. I haven';t been able to compare my receiver with any of the marantz or denon. I know audyssesy is key but other than that what sound difference will I hear in marantz or denon compared to what I have. I want some audio gurus here to help me out understand what is HDAM and if it so special why can't other companies copy it rather than use OP-AMPS as sound&united are touting.