Basic level calibration with an SPL meter is quite easy. EQing a room manually is a different story however. If you are looking for that feature, then it is between the Marantz and Denon. Features alone should not make your decision, since you have to know if you even need all those features. Having a lot of features is great, but if it makes it so complicated that you get frustrated, is it really worth it? I went through that when I setup a friend's Sony DA3ES. The extreme flexibility was a very nice thing to have, but it also meant I had a LOT of things to configure to get it to sound right... Anyway, I'd recommend you go listen to the 3805 and 7500 and pick the one that sounds better to you, since they are going to have most of the same features.