When I compare for example the Onkyo TX-NR5010 between XT32 and Pro the difference is stunning. Like you have a set which is 2-3 times more expensive. The drive and timing is superior. Like you bought a biggerpoweramp. But also the difference in sound is huge. So much warmer and much moe details and air. The stage is wider and deeper as well. The subwoofer is a lot better integrated and has a lot more control and drive as well. I have to tell that I measure at total different hights and places than Audyssey says. There way is ok, but to be honnest by far not good enough what i would want. My way measures a lot more dynamics and details. Also is my way of measurement superior in sharpness of the individual focus of voices and instruments.