Happy;
Congrats on your new system and I am glad we were of some help to you with our reviews. Please realize it is difficult to ABX receivers to determine which one truly sounds "better". There are so many variables involved (ir. Room, speakers, switchbox, cables, personal preferences, etc). Awhile back I was at a local hifi store where I was trying to compare two Yamaha receivers, the 795 and 995. In their setup, the cheaper 795 sounded better to my ears. I later found that the 995 was going thru more relay boxes and was likely attributing to the sonic degradation I was hearing. In any event, both the Z9 and 5803A are nice machines and have their associated strengths and weaknesses.