Summary: Couldn't be happier with this AVR. I have the Energy Take Classic 5-pack and Energy EW-100 sub for speakers, and they have come alive with the NR-1403. Audyssey setup was very good with only a minor crossover tweak needed for my surround speakers. As others have said the sound is on the rich, mellow sound and the soundstage feels all enveloping. I haven't been able to "max" out the volume, because it would be ear splittingly loud. PLENTY OF POWER for my 20x12 room.
Summary: Very impressed! Awesome receiver. First time with Marantz. Bought this receiver as a replacement of an Onkyo to hook up with my Mirage speakers + Polk Pro Sub. I can say the Marantz performs way, way better than the Onkyo. Marantz has an expectacular sound clarity + richness. Every detail is present, and it is able to match perfectly satelites with sub. Even the image seems a lot sharper. Setup is very easy and menus are very intuitive.