I purchased a NAD T775 last Saturday at Chicago's renowned Saturday Audio Exchange.
Its out of the box sound seemed to have all the advantages of the NAD t773 I traded-in, but slightly less of a midrange emphasis and slightly more detail and (for want of a better word) "crispness."
I had trouble with the Audyssey automatic setup/equalization because (a) my speakers are all Maggies and (b) Sunday afternoon traffic generates a high level of ambient noise in my apartment. In quieter surroundings (5am the next morning) things went more smoothly. The system adjusted itself and set its appropriate calculated equalization.
I am still getting used to the new equalized sound. I listen only to classical music and regularly attend live performances. To me the "equalized version" genuinely sounds more like the "real thing" than the same music with equalization turned off.
Two problems remain. I am waiting for NAD tech support to respond with some help with these.
1. I get a massive "POP" whenever the equalization is engaged and a cable channel is changed. The sound is not trivial -- to me it sounds loud enough to damage a speaker and is certainly startling and disturbing every time it takes place.
2. Even though NAD provides software (internet download) for programming the receiver's accompanying learning remote, nowhere is there any mention of how one can obtain, purchase, find, build, etc., the required cable to connect the remote to one's computer.