I was just reviewing the FAQ, and this caught my eye.
What are technologies like YPAO, Audyssey and MCACC? (auto setup and room calibration technologies) ?
The other purpose is to set the AVR's equalization settings. These are supposed to help compensate for uneven frequency response in rooms.
If you are not into making manual adjustments, it's suggested you run the setup as specified in the manual. If you are happy with the results, you are good to go.
These technologies hold a lot of promise, but they are not perfect by any means. They do offer a good starting point, though. You can make adjustments as needed. You may be able to turn off the equalization settings as needed.
I'm not sure how YPAO compares to Audyssey and MCACC, so I will only comment on Audyssey & MCACC. I don't want to get into any subjective opinions about which is better for auto-calibration of the speakers & environement. Both go beyond simple room EQ using up to hundreds of filters that operate in the time domain to address environmental audio reflections, whereas a simple parametric EQ cannot do this. This is a good thing. But unfortunately, you can NOT use Audyssey as a starting point and tweak the EQ on the receiver from there. You actually have to turn off Audyssey (which loses its hundreds of FIR filters) and switch to a manual mode to tweak the EQ, which is just a basic 5 band (up to 9 band on some systems) equalizer to manually tweak it, which is a very rough likeness of the Audyssey curve at best, and provides no correction in the time domain. This is a far cry from what Audyssey provides in Audyssey mode using its FIR filters (which doesn't allow manual EQ tweaks.) MCACC on the other hand lets you make EQ tweaks without disabling your MCACC functionality. And you can save up to 6 MCACC presets. Manual tweaks simply work in conjunction with MCACC rather than replacing it, as is the consequence on the Audyssey based systems. I detailed the difference regarding the consequences of trying to use a custom EQ with Audyssey vs MCACC:http://www.avsforum.com/avs-vb/showt...9#post15252779
I think this is important and worth pointing out this factual operational difference, as once I found this out, I realized MCACC was a better choice for me. I want my cake and eat it, too.