Originally Posted by sworth
I had absolutely no luck using YPAO. It identified one spike, but for levels it was horrible. ...
That is surprising, because it normally works very well for levels and delays. (Not so good for selecting crossover points and deciding "large" versus "small", but those are pretty easy to do manually if one knows the capabilities of one's speakers.) That, by the way, is not just my experience, but professional reviewers also find YPAO to be good at setting levels and delays. (Along with all of the other automatic setup systems.)
I can think of a couple of things that can mess it up. Were you careful in following the directions in the placement and orientation of the microphone? If that is off, then it will set things off. Another possibility is having some other noise in the room when the test signals are run, as the microphone would pick that up and set things "thinking" that that was part of what the system was reproducing. Of course, it is always possible that some part of your system is defective, but I would look to other things first. You might want to write down all of your current settings (so you can easily change it back) and try running YPAO again, carefully following the directions in the manual, and see what it comes up with. Keep in mind, if a speaker has been changed or moved, or any furniture has been moved, if it does its job properly, it will be different from correct settings for how the furniture and speakers were before.
Also, of course, your position in the room will affect the settings. If you are in the room in one spot, and run YPAO, you will get settings for how you being in that position affects the sound, and if you move and run it again, you will get settings for you in that new position. I leave the room when I use it, because if I were in the position I would normally be in, I would be blocking the microphone or causing it to be in a different position.