You maybe right but I highly doubt that, because page 131 does sound like it is for manual setup. I have not owned any recent Yamaha model but have owned Marantz, Denon and an older RX-V659. Typically if you run the auto setup it will ask you if you have the surround back and presence (Yamaha thing) channels hooked up, and do the rest for you. They really don't care, nor should they, about whether you are using external amps or not. They only need to know the what amp\/or amp channel you want to assign for customization if you are using a combination of the main 5 or 7 channels plus zone 2 and 3.\n\nThere is no harm to try anyway right? In any case Yamaha seems to have improved their YPAO by a mile, probably as good as Audyssey XT32 now and even better in certain aspects so you may like the results.\n\nPENG,\nJust to clarify, I can run YPAO without the external amp first? Meaning, I can hook up all 11 channels to the AVR and run the YPAO even though the last two channels are not powered?\n\nOR do I need to run YPAO with the external amp and all of the 11 speakers connected?