Well, maybe your Marantz 8801 has something to do with that. I have heard/read that it is an outstanding performer for HT, 2-channel audio, and multichannel audio. A flagship prepro probably has been built with flagship components from top to bottom. Also, I think you can only engage Audyssey MultEQ XT32 when using a digital connection like HDMI and that alone can account for a better presentation.
Bill
Bill