You also need to determine whether the cross over setting is for LFE only or not. If it is for LFE, crossing lower than 80hz will create a loss of information unless your reciever can componsate for that. (not many can).
But like above, you need to determine for yourself. I have mine crossed at 100hz and after a couple of months I now like it. I would suggest changing your settings a little at a time and then listening to your system for a least a week before making any judgements.