I have a Yammy rx-496 and i have no settings for the crossover. I have all speakers set to small and lfe to sub. I checked the manual and didnt say. Just says when describing LFE..this channel is for 20-120hz. THinking it could be 120? Dont know. I've set my sony sawm40 to around 80..if i go up i notice it getting boomy and starting to take over the mains too much. ANy suggestions?