I'm running an Onkyo DS797 receiver and no, it doesn't have the sub option you mentioned.
The sub is calibrated and the SPL didn't matter. I mentioned in the first post that i even turned down the gain to 10-15% and still heard chuff although a lesser amount. The only way to rid the chuff i've found is to turn down the settings below 0dB in the Onkyo bass management.
LOTR is one heck of a bass pumped movie.

Sorry to hear about your wife's crystal.

"Those who preach the myths of audio are ignorant of truth."