I'll take a shot at it. I do not have an 806.
Set your fronts a small.
Set subwoofer to true.
Set sub crossover to 80.
Leave fronts at default level.
Set sub level in AVR to same as front default
Set center to front defaults +2
I can't help you on the IW, just use your ears
On the sub set the crossover to bypass
On the sub set the level to -9 as a start and adjust to taste
Cheers
Russ
Joined you!