I don't rely on my Denon to auto adjust for speaker crossovers. In my environment, I found taking the lowest published frequency response of each speaker, and adjust 10 -20Hz higher, I get my best 5.1 sound. Also, my one sub, I let the Denon do its auto adjust to 120HZ. I let the Denon set the distances, etc.
I have tried the 80HZ for the 5 speakers, but not the same for my ears. For me Audyssey, is somewhat okay, w/o going the SPL route...etc.